The 1986–87 St. John's Redmen basketball team represented St. John's University during the 1986–87 NCAA Division I men's basketball season. The team was coached by Lou Carnesecca in his nineteenth year at the school. St. John's home games are played at Alumni Hall and Madison Square Garden and the team is a member of the Big East Conference.
Lou Carnesecca started to coach at St. John's University in 1986.