1908 in sports describes the year's events in world sport.
- 25 March — Clube Atlético Mineiro founded
- The Football League – Manchester United 52 points, Aston Villa 43, Manchester City 43, Newcastle United 42, The Wednesday 42, Middlesbrough 41
- FA Cup final – Wolverhampton Wanderers 3–1 Newcastle United at Crystal Palace, London
- Bradford Park Avenue (1908–70) and Tottenham Hotspur elected to the Football League after Lincoln City and Stoke FC are expelled. Stoke FC is not involved in the election process but goes into receivership soon afterwards and is replaced by Tottenham Hotspur, who have lost the election to Bradford Park Avenue.
- 3 February — Panathinaikos, Greece's most successful sports club is founded in Athens, Greece by Georgios Kalafatis.
- 9 March — Internazionale Milan founded
- Club Union of Mexico becomes Club Deportivo Guadalajara
- 19 July — Feyenoord Rotterdam founded
- Carlton wins the 12th VFL Premiership: Carlton 5.5 (35) d Essendon 3.8 (26) at Melbourne Cricket Ground (MCG)
- 10–14 October — Chicago Cubs (NL) defeats Detroit Tigers (AL) to win the 1908 World Series by 4 games to 1
- 4 July — Battling Nelson recovers his World Lightweight Championship from Joe Gans with a 17th-round knockout at Colma, California
- World Middleweight Champion Stanley Ketchel loses his title on 7 September to Billy Papke by a 12th-round technical knockout at Vernon, California, but regains it on 26 November at Colma, California, where he knocks out Papke in the 11th round
- October – Mike "Twin" Sullivan vacates the World Welterweight Championship which remains unresolved until 1914
- 26 December — Jack Johnson becomes the first African American World Heavyweight Champion by defeating Tommy Burns at Sydney, Australia. Johnson holds the title until 1915.
Lineal world champions
- World Heavyweight Championship – Tommy Burns → Jack Johnson
- World Light Heavyweight Championship – vacant
- World Middleweight Championship – Stanley Ketchel → Billy Papke → Stanley Ketchel
- World Welterweight Championship – Mike "Twin" Sullivan → vacant
- World Lightweight Championship – Joe Gans → Battling Nelson
- World Featherweight Championship – Abe Attell
- World Bantamweight Championship – Jimmy Walsh
- County Championship – Yorkshire
- Minor Counties Championship – Staffordshire
- Most runs – Tom Hayward 2337 @ 45.82 (HS 175)
- Most wickets – Colin Blythe 197 @ 16.88 (BB 8–83)
- Wisden Cricketers of the Year – Walter Brearley, Lord Hawke, Jack Hobbs, Alan Marshal, John Newstead
- Sheffield Shield – Victoria
- Most runs – Joe Hardstaff senior 1360 @ 52.30 (HS 135)
- Most wickets – Jack Saunders and Jack Crawford 66 apiece
- Currie Cup – not contested
- Inter-Colonial Tournament – not contested
Tour de France
Olympic Games (Men's Competition)
- Gold Medal – England
- Silver Medal – Ireland
- Bronze Medals – Scotland & Wales
- Inaugural International Skating Union (ISU) Championships for pair skating is held at Saint Petersburg
- Figure skating is held at the 1908 Summer Olympics and is the first winter sport to feature at the Olympics — 16 years before the inaugural Winter Games is held
World Figure Skating Championships
- World Men's Champion – Ulrich Salchow (Sweden)
- World Women's Champion – Lily Kronberger (Hungary)
- World Pairs Champions – Anna Hübler and Heinrich Burger (Germany)
1908 Summer Olympics
- Grand National – Rubio
- 1,000 Guineas Stakes – Rhodora
- 2,000 Guineas Stakes – Norman
- The Derby – Signorinetta
- The Oaks – Signorinetta
- St. Leger Stakes – Your Majesty
- Melbourne Cup – Lord Nolan
- Queen's Plate – Seismic
- January 2 — The first All-Star game in ice hockey history is held at Montreal to benefit the widow of Hod Stuart, killed in an off-season swimming accident.
- January 9–13 – Montreal Wanderers defeat the Ottawa Victorias 9–3, 13–1 (22–4) in a two-game challenge to retain the Stanley Cup.
- March 7 — Montreal Wanderers win the Eastern Canada Amateur Hockey Association (ECAHA) championship for the third year in a row and successfully defend the Stanley Cup.
- March 10–12 – Montreal Wanderers defeat Winnipeg Maple Leafs 11–5, 9–3 (20–8) in a two-game challenge.
- March 14 – Montreal Wanderers defeat Toronto Professionals 6–4 in a one-game challenge to retain the Stanley Cup.
- Lacrosse is played as an Olympic sport for the second and last time (the first having been in 1904). Canada defeats Great Britain: they are the only two teams to compete.
1908 Summer Olympics
- The 1908 Summer Olympics takes place in London
- Great Britain wins the most medals (145) and the most gold medals (56)
The Boat Race
- Championship – Hunslet
- Challenge Cup final – Hunslet 14–0 Hull F.C. at Fartown Ground, Huddersfield
- Lancashire League Championship – Oldham
- Yorkshire League Championship – Hunslet
- Lancashire County Cup – Oldham 16–9 Broughton Rangers
- Yorkshire County Cup – Hunslet 17–0 Halifax
- Professional rugby league begins in Australia with the formation of the New South Wales Rugby League
- South Sydney wins the first Australian championship, defeating Eastern Suburbs 14–12 in the final
- First Australian national rugby league team embarks on the inaugural 1908–09 Kangaroo tour of Great Britain
Home Nations Championship
Speed Skating World Championships
- Australian Men's Singles Championship – Fred Alexander (USA) defeats Alfred Dunlop (Australia) 3–6 3–6 6–0 6–2 6–3
- Wimbledon Men's Singles Championship – Arthur Gore (GB) defeats Herbert Barrett (GB) 6–3 6–2 4–6 3–6 6–4
- Wimbledon Women's Singles Championship – Charlotte Cooper Sterry defeats Agnes Morton 6–4 6–4
- French Men's Singles Championship – Max Decugis defeats Maurice Germot: details unknown
- French Women's Singles Championship – Kate Gillou-Fenwick defeats Pean: details unknown
- American Men's Singles Championship – William Larned defeats Beals Wright 6–1 6–2 8–6
- American Women's Singles Championship – Maud Barger-Wallach defeats Evelyn Sears 6–3 1–6 6–3
- "Scottish Cup Past Winners | Scottish Cup | Scottish FA". www.scottishfa.co.uk. Retrieved 5 February 2021.
- Cyber Boxing Zone
- This award was subtitled Lord Hawke and Four Cricketers of the Year.
- "Cycling-Tour de France list of winners". Eurosport UK. 26 August 2020. Retrieved 18 February 2021.
- "James Braid | British golfer". Encyclopedia Britannica. Retrieved 30 April 2021.
- "Epsom Derby | History, Winners, & Facts | Britannica". www.britannica.com. Retrieved 30 December 2021.