Abu Abdullah Muhammad VI ibn Ismail, also known by his Castilian nickname el Bermejo ("The Red One"), and the regnal names al-Ghālib bi 'llāh and al-Mutawakkil ʿalā 'llāh, was the tenth Sultan of the Emirate of Granada. A member of the Nasrid dynasty, he ruled for a brief period between June or July 1360 and April 1362.
A second cousin and brother-in-law of both Muhammad V and Ismail II, Muhammad VI led a coup that deposed the former and enthroned the latter in August 1359. He increasingly held the power of government during Ismail's rule, and in June or July 1360 he had the new Sultan killed and took the throne to himself. Muslim chronicles portrayed him negatively, describing him as a tyrannical ruler with coarse manners.