List of interstate wars since 1945

This is a list of interstate wars since 1945. Interstate warfare has been defined as military conflict between separate states over a territory, including irregular military forces legitimized by the laws of war applicable to interstate wars due to the invasion or annexation being unlawful. This does not include civil wars and wars of independence, or smaller clashes with limited casualties (fewer than 100 combat deaths). The largest interstate war in history, World War II, involved most of the world's countries, after which the United Nations (UN) was established in 1945 to foster international co-operation and prevent future conflicts. The post-WWII era has, in general, been characterized by the absence of direct, major wars between great powers, such as the United States and (until 1991) the Soviet Union.

1945–1989
Denotes war with more than 10,000 combat deaths at minimum

1990–present
Denotes war with more than 10,000 combat deaths at minimum