The Weapons Cache Case (Finnish: Asekätkentä, Swedish: Vapengömmoaffären) was a Finnish criminal case of the mid-1940s. It concerned a secret and officially unsanctioned military operation following the Continuation War, where a large amount of Finnish Army weapons and equipment was hidden in caches scattered around the country. While the operation was unofficial, there was no Finnish law under which those involved could be prosecuted. An ex post facto law was passed for the purpose in January 1947. In the end, 1,488 people were convicted, most of them sentenced to 1–4 months in prison.