Yakin basasa na Italiya ya kasance yakin basasa a cikin Masarautar Italiya lokacin yakin duniya na biyu daga 8 Satumba 1943 (ranar Armistice of Cassibile) zuwa 2 Mayu 1945 (ranar mika wuya na Caserta), ta hanyar Fascists na Italiya Jamhuriyar Jama'ar Italiya, wata yar tsana ta haɗin gwiwar da aka kirkira a karkashin jagorancin Nazi Jamus a lokacin mulkin Italiya, a kan 'yan jam'iyyar Italiyanci (mafi yawancin tsarin siyasa a cikin Kwamitin 'Yanci na Kasa), da kayan tallafi na Allies, a cikin mahallin yakin Italiya.'Yan bangaran Italiya da sojojin hadin gwiwar Italiya na Masarautar Italiya sun yi yaki da sojojin Jamus na Nazi da suka mamaye.Rikicin makami tsakanin Sojojin Jamhuriyar Jama'ar Jamhuriyar Jama'ar Italiya da Rundunar Sojojin Italiya na Masarautar Italiya ba kasafai ba ne, yayin da aka sami wasu rikice-rikice na cikin gida a cikin motsi na bangaranci.A cikin wannan mahallin, Jamusawa, wani lokacin da 'yan Fascist na Italiya ke taimaka musu, sun aikata laifuka da dama a kan fararen hula da sojojin Italiya.Lamarin da daga baya ya haifar da yakin basasar Italiya shi ne tuhume shi da kama Benito Mussolini a ranar 25 ga Yulin 1943 da Sarki Victor Emmanuel III ya yi, bayan haka Italiya ta sanya hannu kan Rundunar Sojojin Cassibile a ranar 8 ga Satumba 1943, inda ta kawo karshen yakinta da kawance.Duk da haka, sojojin Jamus sun fara mamaye Italiya nan da nan kafin yakin basasa, ta hanyar Operation Achse, sannan suka mamaye Italiya tare da mamaye Italiya fiye da yadda ya kamata bayan yakin, suna iko da arewaci da tsakiyar Italiya tare da samar da Jamhuriyar Jama'ar Italiya (RSI), tare da Mussolini. An nada shi a matsayin jagora bayan da dakarun Jamus suka ceto shi a harin Gran Sasso.Sakamakon haka ne aka kafa rundunar hadin gwiwa ta Italiya don yakar Jamusawa, yayin da sauran sojojin Italiya masu biyayya ga Mussolini suka ci gaba da fafatawa tare da Jamusawa a cikin sojojin Jamhuriyar Republican.Bugu da kari, wata babbar kungiyar juriya ta kasar Italiya ta fara yakin sari-ka-noke da sojojin fasist na Jamus da Italiya.Nasarar adawa da Fascist ta kai ga kisa kan Mussolini, da ‘yantar da kasar daga mulkin kama-karya, da kuma haifuwar jamhuriyar Italiya a karkashin gwamnatin kawancen soji na yankunan da ta mamaye, wadda ta fara aiki har zuwa yarjejeniyar zaman lafiya da Italiya 1947.