Donald Paul Bellisario (born August 8, 1935) is an American television producer and screenwriter. His current television project is NCIS with writer Don McGill.

Donald P. Bellisario was born in North Charleroi in Pennsylvania. His father ran the tavern, where he grew up listening to the war stories of vets returning from WWII. He had a fifteen-year career in advertising before moving to Hollywood. He broke into television as the story editor for "Baa Baa Black Sheep" (1976). His most celebrated works to date are probably "Magnum, P.I." (1980), "Quantum Leap" (1989), and "JAG" (1995). He has been married four times, and has seven children and eight grandchildren.