15 October — World Middleweight ChampionStanley Ketchel is shot and killed at Conway, Missouri, by Walter Dipley, a jealous farm worker. Ketchel is rated by many boxing historians as the best middleweight ever. The title remains vacant until 1913.
December — NHA loses its Cobalt and Haileybury teams, but gains a Quebec team. The Montreal Canadiens are taken over by George Kennedy's Club Athletique Canadien after threatening legal action.
17 September — the 1910 NSWRFL season culminates in a grand final between South Sydney and Newtown which is drawn 4–4. Newtown are crowned premiers by virtue of being minor premiers.