Kammala wannan jumla: Sojojin Jamus sun sake mamaye ƙasar a watan Mayu na 1940, kuma an kashe 'yan Belgium 40,690, fiye da rabin su Yahudawa, a lokacin mamayewar da ta biyo baya da Holocaust. Daga Satumba 1944 zuwa Fabrairu 1945
Ƙungiyar Allies ta 'yantar da Belgium. Bayan Yaƙin Duniya na II, wani yajin aiki ya tilasta wa Sarki Leopold III ya yi murabus a shekara ta 1951, tun da yake 'yan Belgium da yawa sun ji cewa ya yi aiki tare da Jamus a lokacin yaƙin. Congo ta Belgium ta sami 'yancin kai a cikin 1960 yayin Rikicin Kwango; Ruanda-Urundi ya biyo baya tare da' yancin kai shekaru biyu bayan haka. Belgium ta shiga NATO a matsayin memba mai kafa kuma ta kafa ƙungiyar ƙasashen Benelux tare da Netherlands da Luxembourg.