- 331 BC 1 Oct Alexander the Great defeats the Darius III of Persia at Gaugamela, making him master of Asia Minor.
- 1938 1 Oct German troops march into the Sudetenland, Czechoslovakia, under the auspices of the Munich Agreement.
- 1949 1 Oct The People's Republic of China is proclaimed, following the Communist victory in China's civil war.

