Terrance Richard Duff (born February 18, 1936) is a Canadian former professional ice hockey forward who played 18 seasons in the National Hockey League (NHL) from 1955 to 1971. He played for the Toronto Maple Leafs, Montreal Canadiens, Buffalo Sabres, Los Angeles Kings, and New York Rangers.^[1] Duff also briefly served as head coach for the Leafs during the 1979–80 season. Standing 5 feet 10 inches tall and weighing 163 pounds, he was renowned as one of the top small players of his era.^[2]

Born in Kirkland Lake, Ontario, in 1936, Duff was one of 13 siblings. He began playing hockey at a young age with his brothers. At 15, he moved to Toronto to attend St. Michael's College School and play for the school's team, the Toronto St. Michael's Majors. After two years at St. Michael's (1953–1955), Duff joined the NHL, playing his first game in 1955 in a scoreless match between the Montreal Canadiens and the Toronto Maple Leafs. He opted to join the NHL full-time for the 1956-57 season, foregoing his final year of junior eligibility.

Duff won the Stanley Cup six times—twice with Toronto and four times with Montreal. He was inducted into the Hockey Hall of Fame on November 13, 2006, and into the Ontario Sports Hall of Fame in 2014.^[3]

His brother Les Duff also played professional ice hockey, and his great-nephew Cody Goloubef has played in the NHL.^[4]

• 1962 Stanley Cup Champion (with Toronto)
• 1963 Stanley Cup Champion (with Toronto)
• 1965 Stanley Cup Champion (with Montreal)
• 1966 Stanley Cup Champion (with Montreal)
• 1968 Stanley Cup Champion (with Montreal)
• 1969 Stanley Cup Champion (with Montreal)

• List of NHL players with 1000 games played