Jus sanguinis kalma ce ta Latin da ke nufin "damar jini." Yana nufin ƙa'idar doka ta dokar ɗan ƙasa wacce ba a ƙayyade matsayin ɗan ƙasa ta wurin haihuwa ba amma ta hanyar samun ɗaya ko duka biyun waɗanda ƴan ƙasar wata ƙasa ce. Wato idan aka haifi mutum ga iyaye ko iyayen da suke ’yan kasa, to ana daukar wannan mutumin a matsayin dan kasar, ba tare da la’akari da inda aka haife shi ba.
