The 1940–1945 Colonial War Effort Medal (, ) was a Belgian war service medal established by royal decree of the Regent on 30 January 1947 and awarded to government civil servants, magistrates, volunteer members of the female auxiliary service, missionaries, civilian agents of the different departments and civilians who served honourably for at least one year in the Belgian Congo or Ruanda-Urundi colonies of the Kingdom of Belgium in Africa between 10 May 1940 and 7 May 1945.