Yaƙin Balkan na Yaƙin Duniya na Biyu ya fara ne da mamayar ƙasar Italiya a ƙasar Girka a ranar 28 ga Oktoban 1940. A farkon watannin 1941, farmakin Italiya ya tsaya cik kuma wani harin da Girka ta kai ga Albaniya .Jamus ta nemi taimakon Italiya ta hanyar tura sojoji zuwa Romania da Bulgaria tare da kai wa Girka hari daga gabas.A halin da ake ciki kuma, Burtaniya ta yi saukar da sojoji da jiragen sama domin su harhada kariyar Girka.Juyin mulkin da aka yi a Yugoslavia a ranar 27 ga Maris ya sa Adolf Hitler ya ba da umarnin mamaye kasar.Yugoslavia da Jamus daItaliya suka fara a ranar 6 ga Afrilu 1941, a lokaci guda tare da sabon yakin Girka;a ranar 11 ga Afrilu, Hungary ta shiga cikin mamayewa.A ranar 17 ga Afrilu Yugoslavs sun rattaba hannu kan yarjejeniyar zaman lafiya, kuma a ranar 30 ga Afrilu duk babban yankin Girka na karkashin ikon Jamus ko Italiya.A ranar 20 ga Mayu Jamus ta mamaye Crete ta sama, kuma a ranar 1 ga Yuni duk sauran sojojin Girka da na Birtaniyya a tsibirin sun mika wuya.Ko da yake ba ta shiga cikin hare-haren da aka kai a watan Afrilu ba, Bulgaria ta mamaye sassan biyu na Yugoslavia da Girka jim kadan bayan haka don sauran yakin da ake yi a yankin Balkan.