Muhakkima (Arabic محكمة) was one of the earliest groups to form within the Kharijite movement. The name of the movement is derived from its opposition to arbitration as a means to determine a successor, on the grounds that "judgement belongs to Allah alone (lā ḥukma Illā li-llah)."
The Muhakkima were those early opponents of the Caliph Ali ibn Abi Talib. Among the movement's leaders was Abdullah ibn Wahb al-Rasibi. They were defeated at the Battle of Nahrawan.
Ibadi Islam is the only extant group which claims to have originated in the Muhakkima movement.