Blair David Mackasey (born December 13, 1955) is a former professional ice hockey defenceman. He was drafted in the fourth round, 55th overall, by the Washington Capitals in the 1975 NHL Entry Draft. He was also drafted by the Indianapolis Racers (fourth round, 47th overall) of the World Hockey Association in the 1975 WHA Amateur Draft. Mackasey played just one game in the National Hockey League, with the Toronto Maple Leafs during the 1976–77 season. He also played minor-league baseball for two seasons in the Montreal Expos organization.