Jacob Muzzin (born February 21, 1989) is a Canadian professional ice hockey defenceman currently playing for the Toronto Maple Leafs of the National Hockey League (NHL). Originally drafted by the Pittsburgh Penguins in the 2007 NHL Entry Draft, Muzzin went unsigned and returned to the Sault Ste. Marie Greyhounds of the Ontario Hockey League (OHL) as an overage player. There he served as team captain and won the Max Kaminsky Trophy as the top defenceman in the OHL. As a free agent, Muzzin signed with the Los Angeles Kings in 2010, winning a Stanley Cup with the team in 2014.
Internationally, Muzzin has represented Canada at the 2015 IIHF World Championship and 2016 World Cup of Hockey, winning gold in both.