Muhammad Gasa (Arabic:محمد قاسا) (died 1583) was the firstImam of theImamate of Aussa. Muhammad Gasa abandoned the capital ofHarar and relocated his capital to the desert oasis ofAussa. He subsequently became the first ruler and founder of the newImamate of Aussa.

Muhammad Gasa, a relative ofAhmad ibn Ibrahim al-Ghazi andNur ibn Mujahid, was electedimam on September 1577.Hararis hoped that Muhammed,because of his illustrious lineage, he would create a new sense of unity, and inspire them to resist within the walls, if not lead them to victory outsideof them. To their disappointment, the first thing Muhammed did when he came to power was to transfer the capital from Harar to Aussa in the Afardesert. Muhammad thought that this new capital would be less accessible to Oromo raids, but it did not appear to be that secure as the Oromos continually raided it anyways. In 1583 Muhammad was killed while in battle with the Warra Daya Oromos. His death was followed by a succession crisis in which eight imams succeeded each other in less than five years.^[1][2][3]