Jam Sahib is the title of the ruling prince of Nawanagar, now known as Jamnagar, an Indian princely state. The Jam Sahibs were from the Jam Jadeja clan, who are a branch of Samma rajput. The name of Jamnagar was derived from the same root.

The title Jam Sahib is also used by the ruler of the State of Las Bela in Balochistan, whose origins are in Samma rajputs.