Michael Barry Sullivan (born February 27, 1968) is an American ice hockey coach and former player. He is currently the head coach of the Pittsburgh Penguins of the National Hockey League (NHL). He was a fourth round selection, 69th overall, by the New York Rangers at the 1987 NHL Entry Draft and played 11 NHL seasons with the San Jose Sharks, Calgary Flames, Boston Bruins and Phoenix Coyotes. Internationally, he represented the United States twice, including at the 1997 World Championship.
Sullivan turned to coaching upon his retirement in 2002 and served two seasons as the head coach of the Boston Bruins between 2003 and 2005. He was formerly an assistant coach with the Vancouver Canucks, a position he held during the 2013–14 NHL season. After serving as head coach of the Wilkes-Barre/Scranton Penguins, he took over as head coach of the Pittsburgh Penguins in December 2015, and led the team to back-to-back Stanley Cup championships.