Iimamai sha biyu ( Larabci: ٱلَأَئِمَّة ٱلْٱثْنَا عَشَر‎ , al-ʾAʾimmah al-ʾIthnā ʿAšar ; Persian , Davâzdah Emāmân ) shuwagabanni ne kuma masu yiwa annabi Muhammad fatawa ga reshe goma sha biyu na Shī'ah Islam . Kamar yadda Sha biyu 'yan shia waɗannan goma sha biyu jagorori ne da Allah yayi ishara ga shiriya na Musulmi, kuma domin kariya daga Musulunci, kuma su ne ma'asumi (mara zunubi). Musulman Shia goma sha biyu ne suka ce an faɗi imamai goma sha biyu a cikin Hadisi (maganar Muhammad). Musulmin Shia goma sha biyu sun yi imani cewa wadannan limaman suna da masaniya game da kowane abu da Allah ya gaya musu. Ali shi ne Sahabai na farko a wannan layin kowane Sahabi da ne ga Iimamin da ya gabata, ban da Husayn bn Ali wanda yake dan uwan Hasan bn Ali . Imami na karshe shine Imam al-Mahadi, wanda yake raye kuma zai bayyana a ƙarshen zamani. Nasr (1979), p.10 Momen (1985), p.174