Fifteenth Avenue is a road in New York. Fifteenth Avenue, 15th Avenue or 15 Av may also refer to:
Fifteenth Avenue station, San Francisco, California Fifteenth Avenue station (Muni Metro), San Francisco, California Fifteenth Avenue Stadium, Rockford, Illinois Fifteenth Avenue Bridge, Pittsburgh, Pennsylvania Fifteenth Avenue Bridge (Seattle) 15 Av, the fifteenth day of Av, the fifth month of the Hebrew calendar Tu B'Av a Jewish holiday observed on 15 Av