Abu Nasr Muhammad (died 1015 or 1016) was the ruler of Gharchistan from an unknown date to the 990s. He was from an Iranian princely family which ruled Gharchistan, and bore the title of Shar (meaning "greatness and lordship"). Although the family had already ruled the region before Abu Nasr Muhammad, he is the first known member of the family. His father was named Asad, and may have ruled before him.