September 4, 1927
1st Chess Olympiad — FIDE chess tournament for national teams
Davisson–Germer experiment — experiment
UK recognized the independence of Ibn Saud and sovereignty of the Kingdom of Hejaz & Nejd
1927 South American Championship — 1927 football championship
World Chess Championship 1927 — chess championship
Petrushka — 1911 ballet by Igor Stravinsky, Michel Fokine and Alexandre Benois, Ballets Russes
1927 anti-foreigner riots in Nanking
1927 Italian battle in Libya
1927 riot in a Japanese concession in China
Shanghai massacre of 1927 — mass arrests and executions of members of the Chinese Communist Party and some leftists of the Kuomintang by the Nationalist government (1927-1928)