Matsugunin faɗuwa shine "matsuguni da aka ƙera don ba da kariya daga faɗuwar fashewar makaman nukiliya". Yawanci wani tsari ne mai ƙarfi ko sararin samaniya wanda aka yi niyya don kare mutane da dabbobi daga illolin da ke haifar da fashewar makaman nukiliya. An gina matsugunan faɗuwa sosai a lokacin yaƙin cacar baka a matsayin riga-kafi daga yuwuwar harin nukiliya.
