The 1916 Games were cancelled due to World War I and the 1940 and 1944 Games were cancelled due to World War II.
The 1940 Olympic Games Was Not Held
The 1940 Olympic Games were originally scheduled to be held in Tokyo, Japan, but several countries planned to boycott the Games there because Japan was waging an aggressive war in Asia and then Japan itself decided the Games would be a distraction to their military goals.
The Games were then rescheduled to be held in Helsinki, Finland, but the start of World War II in 1939 caused the Games to be cancelled.
Olympic Games (cancelled)
