Louis Jean Joseph Leblanc (born January 26, 1991) is a Canadian former professional ice hockey player. A centre, Leblanc played minor hockey in the Montreal region before he moved to the United States in 2008, playing one season with the Omaha Lancers of the United States Hockey League (USHL) and becoming Rookie of the Year. Eligible for the 2009 NHL entry draft, he was selected 18th overall by the Montreal Canadiens. He then enrolled at Harvard University and spent one season with the Crimson, being named Ivy League Rookie of the Year, before he signed a contract with the Canadiens in 2010. Later that year Leblanc joined the Montreal Juniors, who had earlier acquired his Quebec Major Junior Hockey League (QMJHL) playing rights.

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Leblanc spent three seasons in the Canadiens organization, mainly playing for their American Hockey League (AHL) affiliate but appearing in only 50 National Hockey League (NHL) games over two seasons, before being traded in 2014 to the Anaheim Ducks, who kept him in the AHL. In 2015, Leblanc moved to Europe, joining HC Slovan Bratislava of the Kontinental Hockey League (KHL), though he played only seven games for them before being released. After appearing in four games for Lausanne HC of the Swiss National League A, he retired from hockey. Internationally, Leblanc played in the 2008 Ivan Hlinka Memorial Tournament, where Canada won the gold medal, and in the 2011 World Junior Ice Hockey Championships, where he helped Canada win a silver medal. Leblanc was considered a draft bust, having failed to reach his potential and retiring from hockey at an early age.