1905 in sports describes the year's events in world sport.
- Ohio League championship – Massillon Tigers
- Western Pennsylvania Championship – Latrobe Athletic Association
- The college football season is blighted by a spate of serious injuries, some fatal, and U S President Theodore Roosevelt calls upon the game's authorities to reform it.
- 6 October — Night-time football is played west of the Mississippi for the first time (see 1905 Cooper vs. Fairmount football game)
- December 25 — An experimental game using new rules is played in Wichita, Kansas under the supervision of John H. Outland. Proposed rules changes include the addition of the forward pass.
- The Football League – Newcastle United 48 points, Everton 47, Manchester City 46, Aston Villa 42, Sunderland 40, Sheffield United 40
- 1905 FA Cup final – Aston Villa 2–0 Newcastle United at Crystal Palace, London.
- 14 March — foundation of Chelsea F.C.
- Alf Common becomes the first player ever to be transferred for £1,000 when he moves from Sunderland to Middlesbrough
- The First and Second Divisions are expanded from eighteen to twenty teams each ahead of the 1905–06 season, bringing the total number of League clubs to 40. New clubs elected to the league include Chelsea, Hull City and Leeds City.
- Scottish Football League – Celtic
- Scottish Cup final – Third Lanark 3–1 Rangers at Hampden Park (replay, following 0–0 draw at Hampden Park)
- 13 May — James J. Jeffries announces his retirement from boxing and relinquishes the World Heavyweight Championship title
- 3 July — Jeffries referees the Marvin Hart v. Jack Root fight at Reno and "awards" his title to Hart, who has won by a 12th-round knockout. Besides winning this bout, Hart has earlier in the year defeated Jack Johnson over 20 rounds at San Francisco. Hart holds the title until 1906.
- 9 September — Battling Nelson defeats Jimmy Britt by an eighteenth-round knockout to win the World Lightweight Championship.
- 20 December — Bob Fitzsimmons loses his World Light Heavyweight Championship to Philadelphia Jack O'Brien on a 13th-round technical knockout in San Francisco. O'Brien effectively relinquishes the title soon afterwards and it remains vacant until 1914.
Lineal world champions
- World Heavyweight Championship – James J. Jeffries → vacant → Marvin Hart
- World Light Heavyweight Championship – Bob Fitzsimmons → Philadelphia Jack O'Brien → vacant
- World Middleweight Championship – Tommy Ryan
- World Welterweight Championship – Barbados Joe Walcott
- World Lightweight Championship – Jimmy Britt → Battling Nelson
- World Featherweight Championship – Abe Attell
- World Bantamweight Championship – Joe Bowker → vacant → Jimmy Walsh
- County Championship – Yorkshire
- Minor Counties Championship – Norfolk
- Most runs – C B Fry 2801 @ 70.02 (HS 233)
- Most wickets – Walter Lees 193 @ 18.01 (BB 9–81)
- Wisden Cricketers of the Year – David Denton, Walter Lees, George Thompson, Joe Vine, Levi Wright
- Sheffield Shield – New South Wales
- Most runs – Warwick Armstrong 460 @ 57.50 (HS 200)
- Most wickets – Frederick Collins 27 @ 23.37 (BB 6–64)
- Currie Cup – not contested
- Inter-Colonial Tournament – not contested
Tour de France
World Figure Skating Championships
- Grand National – Kirkland
- 1,000 Guineas Stakes – Cherry Lass
- 2,000 Guineas Stakes – Vedas
- The Derby – Cicero
- The Oaks – Cherry Lass
- St. Leger Stakes – Challacombe
- Melbourne Cup – Blue Spec
- King's Plate – Inferno
- Ottawa Hockey Club wins a challenge series against the Dawson City Nuggets of Dawson City, Yukon two games to nil. The Dawson club has travelled over 4,000 miles by dog sled, boat and train to play the Silver Seven but are outmatched. Frank McGee, incensed by comments from the Dawson squad, scores 14 goals as Ottawa wins the second game 23–2.
- Ottawa wins the Federal Amateur Hockey League (FAHL) championship to defend the Stanley Cup.
- Ottawa defeats Rat Portage Thistles 2 games to one in a Stanley Cup challenge.
- 9 December — Eastern Canada Amateur Hockey Association (ECAHA) is formed from teams in the Canadian Amateur Hockey League (CAHL) and the FAHL. Stanley Cup champion Ottawa and Montreal Wanderers join from FAHL and Montreal, Montreal Shamrocks, Montreal Victorias and Quebec Bulldogs join from the CAHL.
- The Intercollegiate Lacrosse Association (ILA) is replaced by the Intercollegiate Lacrosse League, which will be renamed the U.S. Intercollegiate Lacrosse Association (USILA) in 1929.
Gordon Bennett Cup
- Sixth and final running of the Gordon Bennett Cup takes place in France on the Charade Circuit, then known as the Circuit d'Auvergne, at Clermont-Ferrand. As road racing has been banned in France, this is the first time the trophy is contested on a circuit. The winner for the second successive year is Léon Théry (France) driving a Richard-Brasier.
- The fourth Circuit des Ardennes is run on 7 August over 591.255 km (118.251 km x 5 laps) in the vicinity of Bastogne. The winner is Victor Hémery (France) driving a Darracq 80 hp in a time of 5:58:32.
- The second Vanderbilt Cup is run on 14 October over 455.430 km (45.543 km x 10 laps) on Long Island. The winner is Victor Hémery (France) driving a Darracq 80 hp in a time of 4:36:08.
Shelsley Walsh Speed Hill Climb
- First running of the Shelsley Walsh Speed Hill Climb on August 12, still run annually on the same course.
The Boat Race
- Championship – Oldham
- Challenge Cup final – Warrington 6–0 Hull Kingston Rovers at Headingley Rugby Stadium, Leeds
- Lancashire League Championship – not contested
- Yorkshire League Championship – not contested
- County cup competitions introduced in both Lancashire and Yorkshire ahead of the 1905–06 season. These are knockout competitions in the same format as the Challenge Cup except for their regional character.
Home Nations Championship
Speed Skating World Championships
- Inaugural Australian Championship is held, but for men only
- Australian Men's Singles Championship – Rodney Heath (Australia) defeats Arthur Curtis (Australia) 4–6 6–3 6–4 6–4
- Wimbledon Men's Singles Championship – Laurence Doherty (GB) defeats Norman Brookes (Australia) 8–6 6–2 6–4
- Wimbledon Women's Singles Championship – May Sutton Bundy (USA) defeats Dorothea Douglass Lambert Chambers (GB) 6–3 6–4
- French Men's Singles Championship – Maurice Germot (France) defeats André Vacherot (France): details unknown
- French Women's Singles Championship – Kate Gillou (France) defeats Yvonne de Pfeffel (France) 6–0 11–9
- American Men's Singles Championship – Beals Wright (USA) defeats Holcombe Ward (USA) 6–2 6–1 11–9
- American Women's Singles Championship – Elisabeth Moore (USA) defeats Helen Homans (USA) 6–4 5–7 6–1
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- "The History of the NCAA". NCAA.org. National Collegiate Athletic Association. Archived from the original on 2007-04-30. Retrieved 2007-05-19.
- "Boca Juniors | History, Stadium, & Notable Players". Encyclopedia Britannica. Retrieved 6 February 2021.
- "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
- "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.