Piccolo
- Piccolo (horse) – 1938: McLennan Handicap
- Piccolo (horse) – 1994–95: Chipchase Stakes, King's Stand Stakes, Nunthorpe Stakes
Pickpocket
Pioneer
- Pioneer (horse) – 1846–47: List of Grand National winners, List of Grand National first four placings
- Pioneer (horse sired by Galopin) – 1889: St. James's Palace Stakes
Pipedreamer
- Pipedreamer – 2007–09: Cambridgeshire Handicap, Prix Dollar, York Stakes, 2008 WTR, 2009 WTR
- Pipedreamer (horse sired by Breeder's Dream) – 1979: Bunbury Cup, Royal Hunt Cup
Pirouette
- Pirouette (horse) – 1989: Athasi Stakes, Renaissance Stakes
- Pirouette (horse sired by Sayajirao) – 1952: Cherry Hinton Stakes
Pizarro
- Pizarro (horse) – 2002–05: Champion Bumper, Dr P. J. Moriarty Novice Chase, Monksfield Novice Hurdle, 2005 Cheltenham Gold Cup (fell) etc.
- Pizarro (horse sired by Bloomsbury) – 1858: Union-Rennen
Planet
- Planet (horse) – b. 1855, see Algerine (horse), Woodburn Stud
- Planet (horse sired by Bay Middleton) – 1846: Molecomb Stakes
- Planet (horse sired by St Frusquin) – 1917: November Handicap
Play On
- Play On (horse) – b. 1981
- Play On (horse sired by Weissdorn) – 1934: Lincoln Handicap
Playfair
- Playfair (horse) – 1888: List of Grand National winners, List of Grand National first four placings
- Playfair (horse sired by Oxford) – 1872: Cambridgeshire Handicap
Pocahontas
- Pocahontas (horse) – b. 1837
- Pocahontas (horse sired by Saunterer) – 1867: Union-Rennen
Poet
- Poet (horse) – 2009–10: Kilternan Stakes, Rose of Lancaster Stakes, 2009 WTR
- Poet (horse sired by Janitor) – 1944: Mehl-Mülhens-Rennen, Union-Rennen
Poker
- Poker (horse) – b. 1963, see A P Valentine, Seattle Dancer, Swale (horse)
- Poker (horse sired by Bruleur) – 1934: Park Hill Stakes
Polaire
- Polaire (horse) – 1999: Pretty Polly Stakes (Ireland)
- Polaire (horse sired by Le Volcan) – 1950: Prix de Flore, Prix de Royallieu
Pole Position
- Pole Position (horse) – 1979: Robert B. Lewis Stakes, San Felipe Stakes
- Pole Position (horse sired by Sharpo) – 1989–90: Prix Eclipse, Prix de Meautry
Pollen
- Pollen (horse) – 2010: Park Express Stakes
- Pollen (steeplechase horse) – 1919: List of Grand National first four placings
Poltava
Pomare
- Pomare (horse) – no links
- Pomare (horse sired by Eble) – 1951–53: Poule d'Essai des Pouliches, Prix d'Arenberg, Prix Messidor
- Pomare (horse sired by Saint Just) – 1922–23: Prix La Rochette, Prix de Royallieu, Prix de Royaumont
Pontenuovo
Pontifex
- Pontifex (horse) – 1969: Saratoga Special Stakes
- Pontifex (horse sired by Darius) – 1962: Beresford Stakes
Porthos
- Porthos (horse) – 1935–38: Grande Course de Haies d'Auteuil (disq.), Prix du Pin
- Porthos (horse sired by Royal Oak) – 1852: Prix du Jockey Club
Portmarnock
- Portmarnock (horse) – 1895: Irish Derby
- Portmarnock (horse sired by Fairway) – 1937: Champagne Stakes (Great Britain)
Poseidon
- Poseidon (horse) – b. 1903
- Poseidon (horse sired by Polar Falcon) – 2000: Premio Ambrosiano, Premio Federico Tesio
Potocki
- Potocki (horse) – 1857–58: Prix du Cadran, Prix du Jockey Club
- Potocki (horse sired by Pommern) – 1928: Prince of Wales's Stakes
Precious Boy
- Precious Boy – 2007–09: Grosse Europa-Meile, Herzog von Ratibor-Rennen, Mehl-Mülhens-Rennen, Preis des Winterfavoriten, 2008 WTR, 2009 WTR
- Precious Boy (horse sired by Taufan) – 1991–94: Imperial Cup, Scottish Champion Hurdle
Precocious
- Precocious (horse) – 1973: Inter Dominion Trotting Championship
- Precocious (horse sired by Mummy's Pet) – 1983: Gimcrack Stakes, Molecomb Stakes, Norfolk Stakes (Great Britain)
Present
- Present (horse) – 1965: Prix du Chemin de Fer du Nord
- Present (horse foaled in 1929) – 1931: Critérium de Maisons-Laffitte, Prix Eclipse
Presto
- Presto (horse) – 1904–05: Prix du Conseil de Paris, Prix de Guiche, Prix Perth, Prix du Pin, Prix du Prince d'Orange
- Presto (horse sired by Javelot) – 1967–68: Mehl-Mülhens-Rennen, Prix Quincey
Pretender
- Pretender (horse) – b. 1866
- Pretender (horse foaled c. 1934) – 1938: Prix Gladiateur
Priam
- Priam (horse) – b. 1827
- Priam (horse sired by Pharis) – 1943–46: Hardwicke Stakes, Prix d'Ispahan, Prix Jacques Le Marois, Prix Jean-Luc Lagardère etc.
Pricket
- Pricket (horse) – 1996: Pretty Polly Stakes (Great Britain)
- Pricket (horse sired by Twelve Pointer) – 1931: Duke of York Handicap
Pride
- Pride (horse) – b. 2000
- Pride (horse sired by Merry Hampton) – 1896: Queen Alexandra Stakes, Queen's Vase
Primary
- Primary (horse) – 1986: Ebor Handicap
- Primary (horse sired by Giant's Causeway) – 2006: Gran Premio d'Italia, Sandown Classic Trial
Primrose
- Primrose (horse) – 1891–92: Poule d'Essai des Pouliches, Prix de Diane, Prix Gladiateur, Prix Noailles
- Primrose (horse sired by Rose Prince) – 1935: Prix de Pomone
- Primrose (steeplechase horse) – 1870: List of Grand National first four placings
Prince Regent
- Prince Regent (horse) – 1968–70: Irish Derby, Prix Greffulhe, Prix Lupin, Prix de Ris-Orangis, Prix Saint-Roman
- Prince Regent (horse sired by My Prince) – 1942–47: Cheltenham Gold Cup, Irish Grand National, List of Grand National first four placings
- Prince Regent (horse sired by Prince Llewellyn) – 1841: Union-Rennen
Prince Rouge
- Prince Rouge – 1954: Prix Hocquart
- Prince Rouge (horse foaled c. 1932) – 1936: Prix de Reux
Prince Rupert
- Prince Rupert (horse) – 1946: Supreme Novices' Hurdle
- Prince Rupert (horse sired by Eager) – 1909: July Stakes
- Prince Rupert (horse sired by Prince Tenderfoot) – 1988: Celebration Mile
Princess Eboli
- Princess Eboli (horse) – 1978: Cheshire Oaks, Lancashire Oaks
- Princess Eboli (horse sired by Linden Tree) – 1976: Hamburger Stuten-Preis, Preis der Diana
Priolo
- Priolo (horse) – b. 1987
- Priolo (horse sired by Hierocles) – 1949: Prix Dollar
Private Line
- Private Line (horse) – 1978: Duke of York Stakes
- Private Line (horse sired by Private Account) – 1995: Atalanta Stakes
Proclamation
- Proclamation (horse) – 2005: Heron Stakes, Jersey Stakes, Sussex Stakes, 2005 WTRR
- Proclamation (horse sired by Hampton) – 1899: November Handicap
Producer
- Producer (horse) – 1979: Prix Chloe, Prix de la Forêt, Prix de l'Opéra, Prix de Royaumont
- Producer (horse sired by Dutch Art) – 2012–13: King Richard III Stakes, Supreme Stakes
Prolific
- Prolific (horse) – 1984: Australian Derby
- Prolific (horse sired by Preciptic) – 1960: Jockey Club Stakes, Queen's Vase
- Prolific (renamed Able Speed) – 2008: Richmond Stakes
Prospero
- Prospero (horse) – 1982–83: Prix du Muguet, Prix du Pin
- Prospero (horse sired by Whiskey) – 1804: Newmarket Stakes
Prudence
- Prudence (horse) – 1860: Gimcrack Stakes
- Prudence (horse sired by Sayani) – 1953: Prix Eclipse
- Prudence (horse sired by Wellingtonia) – 1886: Prix de Meautry
Prudhomme
- Prudhomme (horse) – 1920: National Hunt Chase Challenge Cup
- Prudhomme (horse sired by Cymbal) – 1882: Chester Cup
Prunus
- Prunus (horse) – 1918–34: Deutsches St. Leger, Mehl-Mülhens-Rennen, Leading sire in Germany
- Prunus (horse foaled in 1920) – 1922: Seaton Delaval Stakes
Prytanee
- Prytanee (horse) – 1886: Grand Prix de Vichy-Auvergne
- Prytanee (horse foaled in 1928) – 1931: Prix Berteux
Punch
Punctilio
- Punctilio – 1982: International Stakes (Ireland)
- Punctilio (horse sired by Florentine) – 1901: Cheveley Park Stakes
Purser
Pyrus
- Pyrus (horse) – 2006: Individual endurance at Equestrian Games
- Pyrus (racehorse) – 2000: Richmond Stakes
Queen of Sheba
- Queen of Sheba (horse) – 1878, see Crabbet Arabian Stud
- Queen of Sheba (horse) – 1951–52: Cheshire Oaks, Irish 1,000 Guineas, Royal Hunt Cup
Queen of Trumps
- Queen of Trumps – b. 1832
- Queen of Trumps (horse sired by King of Trumps) – 1862: Portland Handicap
Qui Vive
- Qui Vive – 1859: Park Hill Stakes
- Qui Vive (horse sired by Merlin) – 1908: St. Leger Italiano
Quito
- Quito (horse) – 2003–06: Abernant Stakes, Ayr Gold Cup, John of Gaunt Stakes
- Quito (horse) – 2006: Individual jumping at the 2006 FEI World Equestrian Games
Quo Vadis
- Quo Vadis (horse) – b. 1952 (Quarter Horse)
- Quo Vadis (racehorse) – 1903: Grand Prix de Paris, Prix Noailles
Quorum
- Quorum (horse) – 1953: Show Jumping World Championships
- Quorum (horse sired by Vilmorin) – 1957: European Free Handicap, Jersey Stakes, Sussex Stakes
Rachel
- Rachel (horse) – 1961: Nassau Stakes
- Rachel (horse sired by Roi Herode) – 1921: Railway Stakes (Ireland)
Radames
- Radames (horse) – 1964–67: Prix Eclipse, Prix Maurice de Gheest, Prix Paul de Moussac, Zukunfts-Rennen
- Radames (horse sired by Rabelais) – 1919: Grand Prix de Saint-Cloud, Prix d'Ispahan
Radium
- Radium (horse) – b. 1918
- Radium (horse sired by Bend Or) – 1907–08: Doncaster Cup, Goodwood Cup, Jockey Club Cup
Raeburn
- Raeburn (horse) – 1931: La Coupe, Prix Chaudenay, Prix Jean de Chaudenay
- Raeburn (horse sired by Botticelli) – 1967: Premio Parioli
- Raeburn (horse sired by Solario) – 1936: Irish Derby
Raffaello
- Raffaello (horse) – 1885: November Handicap
- Raffaello (horse sired by Fairy King) – 1999: Premio del Giubileo
Raincoat
- Raincoat (horse) – 1916: King Edward Stakes
- Raincoat (horse sired by Barathea) – 2007: Investec Derby Trial
Rarity
- Rarity (horse) – 1934–35: Prix du Chemin de Fer du Nord, Prix Daniel Wildenstein, Prix d'Hédouville, Prix Penelope, Prix Rothschild etc.
- Rarity (horse sired by Hethersett) – 1970–71: Desmond Stakes, Tattersalls Gold Cup
Rat Trap
- Rat Trap (horse) – 1847: Royal Whip Stakes
- Rat-Trap (horse sired by Bizarre) – 1837: Newmarket Stakes
Rataplan
- Rataplan – 1853–55: Doncaster Cup, Queen's Vase
- Rataplan (horse sired by Ermak) – 1905–06: Grand Prix de Vichy-Auvergne, La Coupe, Prix Ganay, Prix de Lutèce
- Rataplan (horse sired by Reform) – 1884: Travers Stakes
Ravel
- Ravel (horse) – 2007: Sham Stakes
- Ravel (horse) – 2008: United States at the 2008 Summer Olympics
- Ravel (horse sired by Levmoss) – 1975: Dee Stakes
Ravioli
- Ravioli (horse) – 1894: Prix Eugène Adam, Prix Noailles, Prix du Prince d'Orange
- Ravioli (horse sired by Clarissimus) – 1925: Premio Roma
- Ravioli (horse sired by Fiterari) – 1938: Prix d'Aumale
Rear Admiral
- Rear Admiral (horse) – 1948: European Free Handicap
- Rear Admiral (horse sired by Beresford) – 1930: Sagaro Stakes
Recorder
- Recorder (horse) – 1877: Goldene Peitsche
- Recorder (horse sired by Remembrancer) – 1811: Craven Stakes
Red Arrow
- Red Arrow (horse) – 1976: Derby Italiano, Gran Premio d'Italia
- Red Arrow (horse foaled c. 1955) – 1959: Prix Perth
Red Gauntlet
- Red Gauntlet – 1960: Jersey Stakes
- Red Gauntlet (horse foaled in 1822) – 1824: July Stakes
Red Lancer
- Red Lancer – 1847: PU 1847 Grand National
- Red Lancer (horse sired by Deploy) – 2004: Chester Vase
Red Shoes
- Red Shoes (horse) – 1946: Test Stakes
- Red Shoes (horse sired by Bois Roussel) – 1951: Falmouth Stakes
Redskin
- Redskin (horse) – 1987: Messenger Stakes
- Redskin (horse sired by Uncas) – 1877: Irish Derby
Reform
- Reform (horse) – 1967: Champion Stakes, Queen Elizabeth II Stakes, St. James's Palace Stakes, Sussex Stakes
- Reform (horse sired by Fazzoletto) – 1869: Goldene Peitsche
Regal Parade
- Regal Parade – 2008–10: Ayr Gold Cup, Hackwood Stakes, Haydock Sprint Cup, Prix Maurice de Gheest, 2009 WTR, 2010 WTR
- Regal Parade (horse sired by Hello Gorgeous) – 1991–93: Marit Sveaas Minneløp
Regal Realm
- Regal Realm – 1982–83: Badminton Horse Trials, Eventing World Championship
- Regal Realm (racehorse) – 2011–12: Oak Tree Stakes, Prestige Stakes
Regent
- Regent (horse) – 2004–06: Switzerland at Summer Olympics, Ind. fr. dressage at Equestrian Games, Ind. sp. dressage at Equestrian Games
- Regent (horse sired by Tantieme) – 1958–60: Prix d'Harcourt, Prix Thomas Bryon
Regret
- Regret (horse) – b. 1912
- Regret (horse foaled in 1943) – 1947: November Handicap
- Regret (horse sired by Sheen) – 1896: Sussex Stakes
Rembrandt
- Rembrandt (horse) – b. 1977 (dressage)
- Rembrandt (horse sired by Border Minstrel) – 1899: La Coupe
- Rembrandt (horse sired by William the Third) – 1912: Derby Italiano, Gran Premio di Milano
Reminiscence
- Reminiscence (horse) – 1901: Northumberland Plate
- Reminiscence (horse sired by Windsor Slipper) – 1951–53: Portland Handicap
Retriever
- Retriever (horse) – 1830: Doncaster Cup
- Retriever (horse sired by Recovery) – 1839: Royal Whip Stakes
Revenue
- Revenue (horse) – 1860: Leading sire in North America
- Revenue (horse) – 1901: List of Melbourne Cup winners
- Revenue (horse sired by Blairfinde) – 1901: Duke of York Handicap
- Revenue (horse sired by Cadeaux Genereux) – 2002: Richmond Stakes
Rhodora
- Rhodora (horse) – 1907–08: 1,000 Guineas Stakes, Dewhurst Stakes, Jersey Stakes
- Rhodora (horse sired by Kircubbin) – 1941: Prix de Fontainebleau
Richelieu
- Richelieu (horse) – 1884–87: Prix du Gros Chêne, Prix de Lutèce
- Richelieu (horse sired by The Palmer) – 1875: Beresford Stakes
Richmond
- Richmond (horse) – 1885: Philip H. Iselin Stakes
- Richmond (horse sired by Royal Palm) – 1961: Anglesey Stakes, Beresford Stakes
- Richmond II – 1929: List of Grand National first four placings
River Dancer
- River Dancer – no links
- River Dancer (horse sired by Irish River) – 1985: Prix Yacowlef
- River Dancer (horse sired by Sadler's Wells) – 2002–04: Prix La Force, Queen Elizabeth II Cup
Riverain
- Riverain – 1913: Prix de Fontainebleau
- Riverain (horse foaled c. 1949) – 1953: Prix Perth
- Riverain (horse sired by Dauphin) – 1899: Prix Vicomtesse Vigier
Riviera
- Riviera (horse) – 2000: Woodbine Mile
- Riviera (horse sired by Isonomy) – 1889: Champagne Stakes (Great Britain)
Rob Roy
- Rob Roy (horse) – 2005–08: Joel Stakes, Sandown Mile, 2006 WTRR, 2008 WTR
- Rob Roy (horse sired by Blair Athol) – 1876: Norfolk Stakes (Great Britain)
Robin Hood
- Robin Hood (horse) – 1865–66: July Stakes, Newmarket Stakes
- Robin Hood (horse foaled c. 1822) – 1826: Ayr Gold Cup
- Robin Hood (horse sired by Galileo) – 2012: 18th 2012 Prix de l'Arc de Triomphe
Rocket
- Rocket (horse) – 1971: Flieger Trophy, Oettingen-Rennen
- Rocket (horse sired by Chatham) – 1858: Cesarewitch Handicap
Rockingham
- Rockingham (horse) – b. 1830
- Rockingham (horse sired by Highflyer) – b. 1781, see Sir Archy
Roman
- Roman (horse) – 1965: Leading broodmare sire in North America
- Roman (horse) – 1978: Show Jumping World Championships
- Roman (horse sired by Lecturer) – 1874: Union-Rennen
Romana
- Romana (horse) – 1984: Fürstenberg-Rennen
- Romana (horse sired by Roi Herode) – 1920: Cheveley Park Stakes
Romantica
- Romantica (horse) – 2012: Prix de la Nonette
- Romantica (horse sired by Never Say Die) – 1962: Princess Royal Stakes
Romarin
- Romarin (horse) – 1995: Turf Classic Stakes
- Romarin (horse foaled c. 1929) – 1933: Prix de Reux
Romeo
- Romeo (horse) – 2006: Ind. freestyle dressage at World Equestrian Games, Ind. special dressage at World Equestrian Games
- Romeo (horse sired by Carnoustie) – 1965: Stockholm Cup International
- Romeo (horse sired by Jock) – 1939: Prix du Gros Chêne
- Romeo (steeplechase horse) – 1862: List of Grand National first four placings
Romulus
- Romulus (horse) – 1962: Greenham Stakes, Hungerford Stakes, Prix du Moulin de Longchamp, Queen Elizabeth II Stakes, Sussex Stakes
- Romulus (horse foaled c. 1899) – 1903: Prix du Gros Chêne
- Romulus (horse sired by Cadland) – 1839: Prix du Jockey Club
Roquefort
- Roquefort (horse) – 1884–91: List of Grand National winners, List of Grand National first four placings
- Roquefort (horse foaled in 1867) – 1869: Prix Morny
Rosa Bonheur
- Rosa Bonheur (horse) – 1857: Royal Hunt Cup
- Rosa Bonheur (horse sired by Kerlor) – 1955: Grand Prix de Deauville
Roscius
- Roscius (horse) – 2000: Cocked Hat Stakes
- Roscius (horse sired by Turcoman) – 1840: Cambridgeshire Handicap
Rossini
- Rossini (horse) – 2006: Individual endurance at Equestrian Games, Team endurance at Equestrian Games
- Rossini (racehorse) – 1999: Anglesey Stakes, Prix Robert Papin
Rouble
- Rouble (horse) – 2001–02: National Spirit Hurdle, Winter Novices' Hurdle
- Rouble (horse sired by Volodyovski) – 1912: Prix d'Ispahan
Roving Minstrel
- Roving Minstrel – 1960: Champagne Stakes (United States)
- Roving Minstrel (horse sired by Cree Song) – 1995: Lincoln Handicap
Rowena
- Rowena (horse) – b. 1817
- Rowena (horse sired by Cranach) – 1954: Prix de Royallieu
Royal and Regal
- Royal and Regal – 1973: Florida Derby
- Royal and Regal (horse sired by Sadler's Wells) – 2007–08: Jockey Club Cup, John Porter Stakes, 2008 WTR
Royal Challenger
- Royal Challenger – 2006: Breeders' Stakes
- Royal Challenger (horse sired by Royal Charger) – 1953: Middle Park Stakes
Royal Harmony
- Royal Harmony – 1969–71: Fayette Stakes
- Royal Harmony (horse sired by Sun Prince) – 1977: July Stakes
Royal Lancer
- Royal Lancer – 1922: Irish St. Leger, St. Leger Stakes
- Royal Lancer (horse sired by Royal Hampton) – 1902: Sussex Stakes
Royal Mail
- Royal Mail (horse) – 1937: List of Grand National winners, List of Grand National first four placings
- Royal Mail (horse sired by Bally Royal) – 1980–81: Bet365 Gold Cup, List of Grand National first four placings
Royal Power
- Royal Power – 2008: Equestrian at the 2008 Summer Olympics – Individual jumping
- Royal Power (racehorse) – 2006: Mehl-Mülhens-Rennen
Rubens
- Rubens (horse) – b. 1805
- Rubens (horse sired by Orsini) – 1971–74: Goldene Peitsche, Herzog von Ratibor-Rennen, Oettingen-Rennen, Preis der Sparkassen-Finanzgruppe
- Rubens (horse sired by Ruy Blas) – 1883: Prix Daru
Rue de la Paix
- Rue de la Paix (horse) – 1978: Premio Carlo d'Alessio
- Rue de la Paix (horse sired by Link Boy) – 1941: Cambridgeshire Handicap
Runnymede
- Runnymede (horse) – 1882: Clark Handicap
- Runnymede (horse sired by Hurry On) – 1924–25: Dee Stakes, July Stakes
- Runnymede (horse sired by Petition) – 1965: Palace House Stakes
Sabinus
- Sabinus (horse) – 1870–71: Ascot Gold Cup, Cambridgeshire Handicap
- Sabinus (horse sired by Salamander) – 1877: Zukunfts-Rennen
Sagace
- Sagace – b. 1980
- Sagace (horse foaled in 1929) – 1932: Prix Greffulhe
Sagacity
- Sagacity (horse) – 2000–01: Critérium de Saint-Cloud, 3rd 2001 Prix de l'Arc de Triomphe
- Sagacity (horse sired by Le Sage) – 1961–62: Geoffrey Freer Stakes, Goodwood Cup, Yorkshire Cup
Sagamore
- Sagamore (horse) – 1989: Leopardstown 2,000 Guineas Trial Stakes
- Sagamore (horse sired by Sagaro) – 1983: Cambridgeshire Handicap
- Sagamore (horse sired by Sainfoin) – 1906: Prix Morny
Sagittarius
- Sagittarius (horse) – 1953: Jamaica Handicap
- Sagittarius (horse sired by Sadler's Wells) – 2003: Walter Nilsens Minneløp
Sailor
- Sailor (horse) – b. 1817
- Sailor (horse sired by L'Amiral) – 1964–67: Grand Prix de Deauville, Prix Maurice de Nieuil
- Sailor II – b. 1952
Sainfoin
- Sainfoin (horse) – b. 1887
- Sainfoin (horse sired by Richmond) – 1893: Caulfield Cup
Saint Michel
- Saint Michel (horse) – 1892: Prix Noailles
- Saint Michel (horse sired by Winkfield's Pride) – 1905: Prix de Fontainebleau
Salambo
- Salambo (horse) – 1895: Prix de Fontainebleau
- Salambo (horse foaled c. 1862) – 1865: Prix de la Forêt
Salerno
- Salerno (horse) – b. 1965
- Salerno (horse foaled c. 1960) – 1964: Zawawi Cup
Salieri
- Salieri (horse) – 1937–38: Prix Eclipse, Prix Edmond Blanc
- Salieri (horse sired by Accipiter) – 1982–83: Challenge Stakes, Diadem Stakes, Hungerford Stakes, Mill Reef Stakes
Salmon Leap
- Salmon Leap – 1931–32: Coronation Cup, Goodwood Cup
- Salmon Leap (horse sired by Northern Dancer) – 1983: Derrinstown Stud Derby Trial, International Stakes (Ireland), Tetrarch Stakes
Salvator
- Salvator (horse) – b. 1886
- Salvator (horse sired by Abendfrieden) – 1948: Oettingen-Rennen
- Salvator (horse sired by Dollar) – 1875: Grand Prix de Paris, Prix Chaudenay, Prix du Jockey Club
Samoan
- Samoan (horse) – 1936: Breeders' Stakes, Prince of Wales Stakes
- Samoan (horse sired by Diesis) – 1988: Superlative Stakes
Samos
- Samos (horse) – 1935: Prix de l'Arc de Triomphe, Prix de Malleret
- Samos (horse sired by Sheshoon) – 1967–68: Prix Gladiateur, Prix Royal-Oak
Samovar
Sanctum
Sancy
- Sancy (horse) – 1972: Prix Greffulhe, Prix Noailles
- Sancy (horse sired by Diamond Jubilee) – 1906–07: Chester Vase, Jockey Club Stakes, Prince of Wales's Stakes
Sandal
- Sandal (horse) – 1888: Challenge Stakes
- Sandal (horse) – 1972: see Michael Stoute
Sansovino
- Sansovino (horse) – b. 1921
- Sansovino (horse sired by Marco) – 1905: Lincoln Handicap
Santenay
- Santenay (horse) – 2002: Elite Hurdle
- Santenay (horse sired by Alzao) – 1998: Diana-Trial
Saphir
- Saphir (horse) – 1904–07: Leading sire in Germany
- Saphir (horse sired by Black Sam Bellamy) – 2009: Bavarian Classic
- Saphir (horse sired by Surumu) – 1988: Hamburger Meile
Sapphire
- Sapphire (horse) – b. 1992 (show jumping)
- Sapphire (racehorse) – 2012: British Champions Fillies' and Mares' Stakes, Give Thanks Stakes, Noblesse Stakes
Sarissa
- Sarissa (horse) – 1977: Princess Margaret Stakes
- Sarissa (horse foaled in 1953) – 1955: Phoenix Stakes
Satan
- Satan (horse) – 1835: Northumberland Plate
- Satan (horse sired by Buisson Ardent) – 1961: Diadem Stakes
Satinette
- Satinette (horse) – 1983: May Hill Stakes
- Satinette (horse sired by Triancourt) – 1952: Prix de Barbeville
Satirist
- Satirist (horse) – 1841–42: Dee Stakes, Queen Anne Stakes, Queen's Vase, St. James's Palace Stakes, St. Leger Stakes
- Satirist (horse sired by Juvenal) – 1899: Toronto Cup Stakes
Saturn
- Saturn (horse) – 2002: Haynes, Hanson and Clark Conditions Stakes
- Saturn (horse sired by Hyperion) – 1951: Hardwicke Stakes
Saunterer
- Saunterer / Saunterer (horse) – 1881: Belmont Stakes, Preakness Stakes
- Saunterer (horse sired by Birdcatcher) – 1858: Goodwood Cup
Sauterelle
- Sauterelle – 1886–87: Prix du Cadran, Prix Greffulhe
- Sauterelle (horse foaled c. 1858) – 1862: Prix du Gros Chêne
Savoyard
- Savoyard (horse) – 1953–56: Prix du Conseil de Paris, Prix Gladiateur, Prix Vicomtesse Vigier
- Savoyard (horse sired by Sayf El Arab) – 1991: Bunbury Cup
- Savoyard (steeplechase horse) – 1887: List of Grand National first four placings
Saxon
- Saxon (horse) – b. 1871
- Saxon (horse sired by The Bard) – 1901: Prix Daru, Prix du Jockey Club, Prix Kergorlay, Prix Lupin
Scamp
- Scamp (horse) – 1921: Gimcrack Stakes, Norfolk Stakes (Great Britain)
- Scamp (steeplechase horse) – 1838: List of Grand National first four placings
Scapa Flow
- Scapa Flow (horse) – 1926: United States Hotel Stakes, Futurity Stakes
- Scapa Flow (British horse) b. 1924
Scorpion
- Scorpion (horse) – b. 2002
- Scorpion (horse sired by Seattle Slew) – 2001: Jim Dandy Stakes
Scottish Memories
- Scottish Memories – 1961–65: Boylesports.com International Hurdle, Cathcart Challenge Cup, Paddy Power Gold Cup, Punchestown Champion Chase
- Scottish Memories (horse sired by Houmayoun) – 1999–2002: Evening Herald Champion Novice Hurdle, Solonaway Stakes
Scribe
- Scribe (horse) – 1994: Gordon Richards Stakes
- Scribe (horse sired by Woful) – 1827: July Stakes
Sea Lord
- Sea Lord (horse) – 2010: Sovereign Stakes, 2010 WTR
- Sea Lord (horse sired by St Damien) – 1911: Prix Chaudenay
Sefton
- Sefton (horse) – b. 1963 (British Army horse)
- Sefton (racehorse) – b. 1875
Seigneur
- Seigneur (horse) – 1881–83: Prix du Cadran, Prix de Condé
- Seigneur (horse sired by Caro) – 1982: Oleander-Rennen
- Seigneur (horse sired by Warrior) – 1951: Prix Jacques Le Marois
Self Sacrifice
Selim
- Selim (horse) – b. 1802
- Selim (horse sired by Ivan) – 1866: Irish Derby
Semillant
- Semillant – 1968–70: Massachusetts Handicap, Prix Dollar, Prix Edmond Blanc, Prix Guillaume d'Ornano
- Semillant (horse foaled in 1950) – 1953: Prix La Force
Senorita
Sensation
- Sensation (horse) – 1996: Falmouth Stakes, Prix de Sandringham
- Sensation (horse sired by Dollar) – 1882: Premio Presidente della Repubblica
Serenade
- Serenade (horse) – 1848–50: Prix de Diane, Prix Gladiateur
- Serenade (horse sired by Rainbow) – 1827: Newmarket Stakes
Sesame
- Sesame (horse) – 1989–90: Blandford Stakes, St. Simon Stakes
- Sesame (horse sired by Reluisant) – 1894: Prix Juigné
Seville
- Seville (horse) – 1953: Summer Stakes (Canada)
- Seville (horse sired by Galileo) – 2011: 10th 2011 Epsom Derby
Seymour
Shamrock City
- Shamrock City – 2000: Canadian Turf Handicap
- Shamrock City (horse sired by Rock City) – 2000: Fairway Stakes
Shannon
- Shannon (horse) – b. 1941
- Shannon (horse sired by Irish Lad) – 1911–14: Prix du Conseil de Paris, Prix Ganay, Prix de Lutèce, Prix de la Salamandre
- Shannon (horse sired by Lambton) – 1871: Doncaster Cup, Goodwood Cup
Sheridan
- Sheridan (horse) – 1993: Beresford Stakes
- Sheridan (horse foaled in 1876) – 1878: Prix de Condé
- Sheridan (horse sired by Clairon) – 1896: Prix Eugène Adam, Prix de Meautry
Shillelagh
- Shillelagh (horse) – 1862: King's Stand Stakes
- Shillelagh (horse sired by Brown Prince) – 1888: Royal Hunt Cup
- Shillelagh (horse sired by King of Trumps) – 1876: Molecomb Stakes
Shocking
- Shocking – b. 2005
- Shocking (horse sired by Rabelais) – 1922: Prix de Royaumont
Siberia
- Siberia (horse) – 1865: 1,000 Guineas Stakes, Coronation Stakes
- Siberia (horse sired by St. Simon) – 1908: Jockey Club Stakes, Nassau Stakes, Park Hill Stakes, Yorkshire Oaks
Signal
- Signal (horse) – 2006: Individual endurance at the 2006 FEI World Equestrian Games
- Signal (racehorse) – 1947: Preis des Winterfavoriten
Silence
- Silence (horse) – 2004: Equestrian at the 2004 Summer Olympics – Team eventing
- Silence (racehorse) – 1887: Ebor Handicap
Silex
- Silex (horse) – 1953–54: Prix du Cadran, Prix Kergorlay
- Silex (horse foaled in 1881) – 1884: Prix Hocquart
Silvana
Silver Birch
- Silver Birch (horse) – b. 1997
- Silver Birch (horse sired by Silver Shark) – 1972: Somerville Tattersall Stakes
Silver Cloud
- Silver Cloud (horse) – 1886: American Derby
- Silver Cloud (horse sired by Aureole) – 1962: Chester Vase, Cumberland Lodge Stakes, Princess of Wales's Stakes
- Silver Cloud (horse sired by Dan Cupid) – 1966–67: Prix Jean-Luc Lagardère, Prix de la Nonette
Sincerely
- Sincerely (horse) – 2000: Delaware Oaks
- Sincerely (horse sired by Yours) – 1974: Prix du Palais-Royal
Sing Sing
- Sing Sing (horse) – 1981: Secretariat Stakes
- Sing Sing (horse sired by Tudor Minstrel) – 1959: Cornwallis Stakes
Sir Charles
- Sir Charles (horse) – 1830–36: Leading sire in North America
- Sir Charles (horse foaled in 1946) – 1950: Supreme Novices' Hurdle
- Sir Charles (horse sired by Hetman Platoff) – 1851: Royal Hunt Cup
- Sir Charles (horse sired by Pero Gomez) – 1880: Norfolk Stakes (Great Britain)
Sir Harry
- Sir Harry – b. 1795
- Sir Harry (horse sired by Soliman) – 1909: Northumberland Plate
- Sir Harry (horse sired by Wildair) – 1927–29: Agua Caliente Handicap, King Edward Stakes
Sir Hugo
- Sir Hugo – b. 1889
- Sir Hugo (horse sired by Newcastle) – 1871: Queen Anne Stakes
Sir John
- Sir John – 1890: Travers Stakes
- Sir John (horse foaled c. 1869) – 1873: Grand Prix de Deauville
- Sir John (steeplechase horse) – 1849–51: 1849 Grand National, List of Grand National first four placings
Sir Oscar
- Sir Oscar – 2003: Affirmed Stakes, Dr. Fager Stakes, In Reality Stakes
- Sir Oscar (horse sired by Mark of Esteem) – 2012: Meilen-Trophy
Sir Ralph
Sisyphus
- Sisyphus (horse) – 1924: Herzog von Ratibor-Rennen
- Sisyphus (horse sired by Outcast) – 1879: Royal Whip Stakes
Siva
- Siva (horse) – 1960: Prix Exbury
- Siva (horse sired by Childwick) – 1913: Prix Chaudenay
Sky Diver
- Sky Diver (horse) – 1964: Whimsical Stakes
- Sky Diver (horse sired by Skymaster) – 1967–68: Stewards' Cup (Great Britain)
Sky High
- Sky High (horse) – b. 1957
- Sky High (horse sired by Hyperion) – 1946: Chester Vase
Sky Ship
- Sky Ship (horse) – 1952: Florida Derby
- Sky Ship (horse sired by Roan Rocket) – 1976: July Stakes, Vintage Stakes
Skylark
- Skylark (horse) – 1876–77: Newmarket Stakes, Queen's Vase
- Skylark (horse foaled c. 1862) – 1866: Portland Handicap
- Skylark (horse sired by Waxy Pope) – 1830–32: Royal Whip Stakes
Skyrocket
- Skyrocket (horse) – 1953: Prix d'Hédouville
- Skyrocket (horse sired by Skyscraper) – 1799: July Stakes
Skyscraper
- Skyscraper (horse) – b. 1786
- Skyscraper (horse sired by Ayrshire) – 1902: Cheveley Park Stakes
Sledge
- Sledge (horse) – 1963: Bing Crosby Handicap
- Sledge (horse sired by Bruce) – 1891: Prix Exbury
Sly Fox
- Sly Fox (horse) – b. 1895
- Sly Fox (horse sired by Flying Fox) – 1905: Prix La Rochette