Marc John Jefferies is an American actor known for his roles in Losing Isaiah, Get Rich or Die Tryin', Power, The Haunted Mansion, Nerve, Stuart Little 2, Brown Sugar and Notorious.

Jefferies began his career as a child model, then actor.^[1] His first major film role was in Losing Isaiah, opposite Halle Berry.^[2] Jefferies had roles throughout his childhood, and continued his work as an adult, including the films Get Rich or Die Tryin',^[1] Notorious,^[3] and Brotherly Love.^[1] Some of his most notable television roles are Darius on Treme^[1] and QDubs on Power. Marc John Jefferies founded the MJJ Acting Academy where he trains actors to discover their own unique acting style. In 2023, he starred opposite Wakeema Hollis in Aurora: A Love Story.