Hubert George Quackenbush, known as Bill Quackenbush, was a Canadian professional ice hockey defenceman who played for the Boston Bruins and Detroit Red Wings in the National Hockey League. During his 14-year career, he was the first defenceman to win the Lady Byng Memorial Trophy. He won the award after playing the entire 1948–49 season without recording a penalty. The penalty-less season was part of a total of 131 consecutive games he played without being assessed a penalty. Quackenbush, considered to be an elite offensive defenceman during his career, was named to the NHL All-Star team five times, played in eight NHL All-Star games and was inducted into the Hockey Hall of Fame in 1976.

Defence or defense in ice hockey is a player position that is primarily responsible for preventing the opposing team from scoring. They are often referred to as defencemen, D, D-men or blueliners. They were once called cover-point.