The Banu Najjar (Arabic: بنو نجّار) were a Jewish tribe who lived in Medina in the time of Muhammad. They are one of the tribes named in his .
The Banu Najjar were also the maternal tribe of Muhammad's grandfather Abdul-Muttalib. Muhammad initially settled with them when he emigrated from Mecca to Medina. The Prophet's Mosque was later built in the same location. During this period, most of the tribe converted to Islam.