A tailgate advertising assembly includes a tailgate and a billboard. The tailgate is for attachment to a rear of a vehicle so as to be moved between a closed position and an open position as for loading and unloading, and has an upper extremity, a lower extremity, opposing side extremities, an inner face, and an outer face. The billboard is engaged to the tailgate, and overlies the outer face of the tailgate. The billboard supports advertising indicia.