John P. Killilea (June 19, 1928 – January 27, 1996) was an American basketball coach and scout. He served as the assistant coach to four National Basketball Association (NBA) team; the Boston Celtics (1972–77), the Milwaukee Bucks (1977–1983), the New Jersey Nets (1983–85), the Houston Rockets (1989–1993). Killilea was hired by the Topeka Sizzlers of the Continental Basketball Association (CBA) as their head coach in 1986 and served in that capacity until he was fired in January 1988 after being called for 15 technical fouls and ejected from three games.