John Cecil "Jack" McIlhargey (March 7, 1952 – July 19, 2020) was a Canadian professional ice hockey defenceman. He played in the National Hockey League with the Philadelphia Flyers, Vancouver Canucks, and Hartford Whalers between 1974 and 1982. After his playing career he worked for both the Canucks and Flyers in coaching roles. He was a scout for the Flyers.