Clark "Jethro" Gillies (born April 7, 1954) is a Canadian former professional ice hockey player.
He provided both physical presence and offensive punch for the National Hockey League's New York Islanders during their four-year run as Stanley Cup champions.
In a career that spanned 958 games, Gillies notched 319 goals, 378 assists, and 1023 penalty minutes.
He was elected to the Hockey Hall of Fame in 2002.