Cika wannan jumla: A 1939 Denmark ta rattaba hannu kan yarjejeniyar rashin kai hari na shekaru 10 da Nazi Jamus amma
Jamus ta mamaye Denmark a ranar 9 ga Afrilu 1940 kuma gwamnatin Denmark ta ba da sauri. Yaƙin Duniya na II a Denmark ya kasance yana da alaƙa da haɗin gwiwar tattalin arziki tare da Jamus har zuwa 1943, lokacin da gwamnatin Denmark ta ƙi ci gaba da haɗin gwiwa kuma rundunar sojan ruwa ta nutsar da yawancin jiragen ruwanta kuma ta aika da yawancin jami'anta zuwa Sweden, wanda ba shi da tsaka tsaki. Resistance na Danish ya gudanar da aikin ceto wanda ya yi nasarar kwashe dubban yahudawa da danginsu zuwa aminci a Sweden kafin Jamusawa su iya aika su zuwa sansanonin mutuwa. Wasu Danes sun goyi bayan Nazism ta hanyar shiga Jam'iyyar Nazi ta Danish ko kuma ba da kansu don yin yaƙi tare da Jamus a matsayin wani ɓangare na Frikorps Danmark. Iceland ta yanke dangantaka da Denmark kuma ta zama jamhuriya mai zaman kanta a shekarar 1944; Jamus ta mika wuya a watan Mayu 1945. A 1948, tsibirin Faroe sun sami mulkin kai. A shekara ta 1949, Denmark ta zama memba mai kafa NATO.