Gregory Charles Papa is an American sportscaster, currently employed as the radio play-by-play announcer for the San Francisco 49ers. He has also broadcast for the Indiana Pacers, Golden State Warriors, Oakland Athletics, San Antonio Spurs, Oakland Raiders and San Francisco Giants during his career.

KNBR is a AM radio station in San Francisco, California, broadcasting on a clear channel from transmitting facilities in Redwood City, California. KNBR's non-directional 50,000-watt class-A signal can be heard throughout much of the western United States and as far west as the Hawaiian Islands at night. For several decades, KNBR enjoyed a long history as the flagship station of NBC's West Coast radio operations.