Baseball

• World Series - New York Giants (NL) defeat Philadelphia Athletics (AL), 4 games to 1, in the last "first" World Series — the first organized by the two modern leagues NL and AL

Football (American)

• The college football season is blighted by 15 fatal injuries and U.S. President Theodore Roosevelt calls upon the game's authorities to reform it blah na.

Football (Australian rules football)

• Fitzroy wins the 9th VFL Premiership (Fitzroy 4.6 (30) d Collingwood 2.5 (17))

Football (soccer)

England

• First Division - Newcastle United win the 1904-05 title.
• FA Cup - Aston Villa beat Newcastle United 2-0
• Alf Common becomes the first player ever to be transferred for £1000
• The First and Second divisions are both expanded from eighteen to twenty teams for the 1905-06 season, bringing the total number of League clubs to 40

Turkey

• The Turkish football club Galatasaray S.K. is founded in Istanbul. The year 1905 appears on the club's logo.

Golf

• June 6-9 British Open - James Braid
• September 20-22 U.S. Open - Willie Anderson
• British Amateur - Arthur Barry
• U.S. Amateur - H. Chandler Egan

Horse racing

• May 10 - Agile wins the Kentucky Derby

Ice hockey

• January 13–16 - Ottawa Hockey Club wins a Stanley Cup challenge series against the Dawson City Nuggets of Dawson City, Yukon two games to none. The Dawson club had travelled over 4,000 miles by dog sled, boat and train to play the Silver Seven but were outmatched.
• January 16 - Frank McGee, incensed by comments from the Dawson squad, scores 14 goals in a 23–2 win.
• March 3 - Ottawa wins the Federal Amateur Hockey League (FAHL) championship to defend the Stanley Cup.
• March 7–11 - Ottawa defeats the Rat Portage Thistles 2 games to 0 in a Cup challenge.
• December 9 - The 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.

Lacrosse

• The Intercollegiate Lacrosse Association (ILA) is replaced by the Intercollegiate Lacrosse League, which was renamed the U.S. Intercollegiate Lacrosse Association (USILA) in 1929.

Births

• January 14 — Sven Rydell, Swedish football (soccer) player (d. 1975)
• January 28 — Fausto dos Santos, Brazilian football (soccer) player (d. 1939)
• March 30 — Mikio Oda, Japanese athlete (d. 1998)
• April 8
• Erwin Keller, German field hockey player (d. ??)
• Bernt Evensen, Norwegian speed skater and cyclist (d. 1979)
• April 14 — Georg Lammers, German athlete (d. 1987)
• April 20 — Jaap Meijer, Dutch track cyclist (d. 1943)
• May 6 — René Dreyfus, French racing driver (d. 1993)
• May 9 — Lili de Alvarez, Spanish multi-sport competitor, tennis champion, author and journalist (d. 1998)
• June 12 — Ray Barbuti, American athlete and American football player (d. 1988)
• July 16 — Richard Corts, German athlete (d. 1974)
• July 22 — Doc Cramer, American baseball player (d. 1990)
• August 28 — Cyril Walters, Welsh cricketer (died 1992)
• August 4 — Edgar Bruun, Norwegian race walker (d. 1985)
• September 19 — Akilles Järvinen, Finnish athlete (d. 1943)
• September 29
• Fidel La Barba, US boxer and sportswriter (d. 1981)
• Edith Mayne, British freestyle swimmer (d. ??)
• October 6 — Helen Wills, American tennis player (d. 1999)
• October 10 — Wally Berger, American baseball player (d. 1988)
• October 20 — Arnold Luhaäär, Estonian weightlifter (d. 1965)
• December 1 — Alex Wilson, Canadian track and field athlete (d. 1994)

Deaths

• September 10, Pete Browning, American baseball player