Back Olimpiese Somerspele 1940 Afrikaans Chuegos Olimpicos de 1940 AN الألعاب الأولمبية الصيفية 1940 Arabic اوليمبياد صيف 1940 ARZ Xuegos Olímpicos de Branu de 1940 AST 1940 Yay Olimpiya Oyunları Azerbaijani Летнія Алімпійскія гульні 1940 Byelorussian Летни олимпийски игри 1940 Bulgarian Jocs Olímpics d'Estiu de 1940 Catalan ئۆڵۆمپیادی ھاوینەی ١٩٤٠ CKB
 Poster for the 1940 Games, when they were scheduled to be held in Tokyo | |
| Location | Tokyo City, Japan Helsinki, Finland |
|---|---|
| Stadium | Meiji Jingu Gaien Stadium Helsingin Olympiastadion |
Summer Winter | |
The 1940 Summer Olympics, officially known as the Games of the XII Olympiad, was a planned international multi-sport event scheduled to have been held from 21 September to 6 October 1940, in Tokyo City, Japan, and later rescheduled for 20 July to 4 August 1940, in Helsinki, Finland following the outbreak of the Second Sino-Japanese War in 1937. They were ultimately cancelled because of World War II alongside the 1940 Winter Olympics in Sapporo, Japan, and were the third games to be cancelled due to war.
Helsinki would eventually host the 1952 Summer Olympics. Tokyo would also later host the 1964 and 2020 Summer Olympics, the latter being postponed to 2021 due to the COVID-19 pandemic.