1917 in sports
| Years in sports: | 1914 1915 1916 1917 1918 1919 1920 |
| Centuries: | 19th century · 20th century · 21st century |
| Decades: | 1880s 1890s 1900s 1910s 1920s 1930s 1940s |
| Years: | 1914 1915 1916 1917 1918 1919 1920 |
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- World Series - Chicago White Sox defeat New York Giants, 4 games to 2
- Victorian Football League - Collingwood wins the 21st VFL Premiership (Collingwood 9.20 (74) d Fitzroy 5.9 (39))
- Rosenborg BK is founded as Odd
- British Open - not played due to World War I
- U.S. Open - not played due to World War I
- PGA Championship - not played due to World War I
- British Amateur - not played due to World War I
- U.S. Amateur - not played due to World War I
- May 12 - Omar Khayyam wins the Kentucky Derby
- March 7–10 - Montreal Canadiens defeat the Ottawa Senators in a play off to win the National Hockey Association (NHA) championship.
- March 2 - Seattle Metropolitans win the Pacific Coast Hockey Association championship.
- March - Toronto Dentals win the Allan Cup.
- March 17–26 - In a best-of-five series held in Seattle, the Metropolitans defeat the Canadiens three games to one to win their first Stanley Cup.
- November 10 - After Eddie Livingston owner of the Toronto NHA team refuses to sell, the NHA votes to suspend operations.
- November 26 - In a secret meeting, several owners of the NHA form the National Hockey League (NHL) to force out the owner of the Toronto Blueshirts NHA team. Toronto's Arena Gardens will operate a temporary franchise in Toronto. The Quebec Bulldogs become members of the new NHL, but are suspended for the season.
- December 19 - The first NHL games are played, beginning the league's inaugural season.
- Third Far Eastern Championship Games held in Tokyo, Empire of Japan
- January 5 — Adolfo Consolini, Italian discus thrower (d. 1969)
- January 9 — Haydn Tanner, Welsh rugby player
- January 24 — Marcel Hansenne, French middle distance runner (d. 2002)
- February 2 — Kishan Lal, Indian field hockey player (d. 1980)
- March 22 — Ewald Cebula, Polish football (soccer) player (d. 2004)
- June 6 — George Newberry, British track cyclist
- September 11 — Daniel Wildenstein, French Thoroughbred racehorse breeder and owner (d. 2001)
- September 20 — Obdulio Varela, Uruguayan football (soccer) player (d. 1996)
- October 11 — Verné Lesche, Finnish ice speed skater (d. 2002)
- October 12 — Roque Máspoli, Uruguayan football (soccer) goalkeeper (d. 2004)
