John Bowie "Fergy" Ferguson Sr. (September 5, 1938 – July 14, 2007) was a professional ice hockey player and executive.

He became interested in the role of enforcer when he saw the more talented Canucks players get hit repeatedly, without having their teammates attempt to respond or dissuade their opponents.

Playing on a line with Beliveau, Ferguson led all NHL rookies in scoring in his first season and finished as runner-up for Calder Trophy in 1963–64.

During his playing career, he won the Stanley Cup five times: in the years 1965, 1966, 1968, 1969, and 1971, and always earned more than 100 penalty minutes in a regular season.

Ferguson was coach for the Sorel Titans, one of six semi-professional Quebec Lacrosse League clubs that played in the 1960s.

Ferguson gained some notoriety because he asked Bobby Clarke to take out Soviet star Valeri Kharlamov with a slash to the latter's ankle.

He lured Anders Hedberg and Ulf Nilsson away from the Winnipeg Jets of the World Hockey Association (WHA) in 1978 to the Rangers.

Ferguson was married to Joan, and they had four children together: John Jr. (former general manager of the Toronto Maple Leafs), Catherine, Chris and Joanne.