1904 in sports describes the year's events in world sport.
- Ohio League championship – Massillon Tigers
- Western Pennsylvania Championship – Latrobe Athletic Association
- 15 November — Canton Athletic Club (later renamed the Canton Bulldogs) is first established.
- World governing body FIFA is founded. The football associations of England, Scotland, Wales and Ireland do not join at this time.
- Formation of the Austrian Football Association (Österreichischer Fußball-Bund or ÖFB)
- The Football League – The Wednesday 47 points, Manchester City 44, Everton 43, Newcastle United 42, Aston Villa 41, Sunderland 39
- FA Cup final – Manchester City 1–0 Bolton Wanderers at Crystal Palace, London.
- National Championship – competition is annulled by the DFB following a protest by Karlsruher FV that matches have not been played on neutral grounds as stipulated by the rules.
- Benfica founded in Lisbon as the Grupo Sport Lisboa. In 1908, it merges with SC de Benfica to form Sport Lisboa e Benfica (SL Benfica).
- Formation of the Swedish Football Association (Svenska Fotbollförbundet or SvFF)
- NL champion New York Giants refuses to participate in the 1904 World Series. Boston Americans repeat as American League champions.
- 29 April — Barbados Joe Walcott meets Dixie Kid to defend the World Welterweight Championship and, though well on top, is disqualified by the referee after 20 rounds for an alleged foul. Kid claims the title but it is subsequently discovered that the referee has bet on Kid to win and so Kid's claim is widely disregarded.
- 30 September — Walcott meets World Lightweight Champion Joe Gans in a non-title fight which is scored a draw after 20 rounds.
- 17 October — Joe Bowker (England) challenges Frankie Neil in London for the World Bantamweight Championship and wins over 20 rounds, the first non-American to hold this title.
- 31 October — Joe Gans meets Jimmy Britt in San Francisco to defend the World Lightweight Championship. Britt knocks Gans down four times but, after the last one in the fifth round, he hits Gans again before he has stood up and is disqualified for the foul. Afterwards, Gans vacates the title which is awarded to Britt. Two years later, Gans will claim that the fight has been fixed by his and Britt's managers.
- 31 December — during a New Year celebration, Walcott accidentally shoots himself in the hand to effectively ending his days as a top prizefighter. While he will return to the ring in 1906 (losing his welterweight title in the process), he never regains his old form and loses most of his subsequent fights.
Lineal world champions
- World Heavyweight Championship – James J. Jeffries
- World Light Heavyweight Championship – Bob Fitzsimmons
- World Middleweight Championship – Tommy Ryan
- World Welterweight Championship – Barbados Joe Walcott
- World Lightweight Championship – Joe Gans → Jimmy Britt
- World Featherweight Championship – Abe Attell
- World Bantamweight Championship – Frankie Neil → Joe Bowker
- County Championship – Lancashire
- Minor Counties Championship – Northamptonshire
- Most runs – Tom Hayward 3170 @ 54.65 (HS 203)
- Most wickets – J T Hearne 145 @ 18.84 (BB 8–49)
- Wisden Cricketers of the Year – Bernard Bosanquet, Ernest Halliwell, James Hallows, Percy Perrin, Reggie Spooner
- Sheffield Shield – New South Wales
- Most runs – Victor Trumper 990 @ 55.00 (HS 185*)
- Most wickets – Wilfred Rhodes 65 @ 16.23 (BB 8–68)
Tour de France
World Figure Skating Championships
- Grand National – Moifaa
- 1,000 Guineas Stakes – Pretty Polly
- 2,000 Guineas Stakes – St. Amant
- The Derby – St. Amant
- The Oaks – Pretty Polly
- St. Leger Stakes – Pretty Polly
- Melbourne Cup – Acrasia
- King's Plate – Sapper
- January — Ottawa Hockey Club defeats Winnipeg Rowing Club to defend the Stanley Cup in a Cup challenge.
- February — Stanley Cup champion Ottawa Hockey Club withdraws from the Canadian Amateur Hockey League (CAHL) over a demand by the league to replay a game.
- February — Ottawa defeats Toronto Marlboros in a Cup challenge.
- 2 March — Ottawa plays Montreal Wanderers to a 5–5 tie in a Cup challenge, but Montreal refuses terms of continuation of series and defaults.
- March — Quebec Bulldogs win the CAHL championship and demand the Stanley Cup, but the trustees rule the Cup stays with Ottawa. Quebec refuses to play Ottawa in a challenge.
- March — Ottawa defeats the Brandon Wheat Kings 2 games to 0 in a Cup challenge.
- 18 December — Dawson City Nuggets begin a 4,000 mile journey by dog sled to play the Ottawa Hockey Club in a Stanley Cup challenge scheduled for 13 January 1905.
Gordon Bennett Cup
- Fifth running of the Gordon Bennett Cup takes place in the Taunus mountains in Germany. The winner is Léon Théry (France) driving a Richard-Brasier.
Circuit des Ardennes
- The third Circuit des Ardennes is run on 25 July over 591.255 km (118.251 km x 5 laps) in the vicinity of Bastogne. The winner is George Heath (USA) driving a Panhard-Levassor 70 hp in a time of 5:30:49.
- William Kissam Vanderbilt II launches the Vanderbilt Cup at a course set out in Nassau County, New York on Long Island. It creates controversy in New York with numerous attempts made, including legal action, to try to prevent it taking place. The inaugural race is run over a 30.24 miles (48.7 km) course of winding dirt roads through Nassau County. Several European drivers with experience of the Gordon Bennett Cup take part and the event is a huge commercial success. The winner is George Heath (USA) driving a Panhard-Levassor 70 hp.
1904 Summer Olympics
- The third Summer Olympics took place in St. Louis, Missouri, United States.
- Lacrosse was played at the Olympics for the first time.
- The first Africans participated in the Olympics: two Tswana athletes competed at the St. Louis Games in the marathon.
- The United States won the most medals (239) and the most gold medals (78).
The Boat Race
Home Nations Championship
Speed Skating World Championships
- Wimbledon Men's Singles Championship – Laurence Doherty (GB) defeats Frank Riseley (GB) 6–1 7–5 8–6
- Wimbledon Women's Singles Championship – Dorothea Douglass Lambert Chambers (GB) defeats Charlotte Cooper Sterry (GB) 6–0 6–3
- French Men's Singles Championship – Max Decugis (France) defeats André Vacherot (France) 6–1 9–7 6–8 6–1
- French Women's Singles Championship – Kate Gillou (France) defeats Françoise Masson (France): details unknown
- American Men's Singles Championship – Holcombe Ward (USA) defeats William Clothier (USA) 10–8 6–4 9–7
- American Women's Singles Championship – May Sutton (USA) defeats Elisabeth Moore (USA) 6–1 6–2
- Curi, Martin (14 April 2016). Soccer in Brazil. Routledge. p. 77. ISBN 978-1-317-62410-3.
- "Scottish Cup Past Winners | Scottish Cup | Scottish FA". www.scottishfa.co.uk. Retrieved 5 February 2021.
- Boston Athletic Association (2011). "Boston Marathon History: 1901-1905". www.baa.org. Boston: Boston Athletic Association. Archived from the original on 2011-02-21. Retrieved March 2, 2011.
- Cyber Boxing Zone
- "Pogacar, 21, 2nd youngest to win Tour de France". ESPN.com. 20 September 2020. Retrieved 8 January 2021.
- "Epsom Derby | History, Winners, & Facts | Britannica". www.britannica.com. Retrieved 30 December 2021.