Cameron Matthew Fowler (born December 5, 1991) is a Canadian-born American professional ice hockey player who is a defenseman for the St. Louis Blues of the National Hockey League (NHL). He was selected 12th overall by the Anaheim Ducks in the 2010 NHL entry draft, for whom he played the first 15 seasons of his NHL career.

A dual citizen, Fowler represents the United States internationally and won a gold medal as a member of the junior team at the 2010 World Junior Championships. He was a member of the Windsor Spitfires team that won the J. Ross Robertson Cup in 2009–10, as well as the 2010 Memorial Cup.

Fowler was born in Windsor, Ontario, the son of Perry and Bridget Fowler. Perry was a native of Newfoundland and Labrador and Bridget is a native of Michigan, making Cam a dual citizen. An employee of the Ford Motor Company, Perry moved his family to Farmington Hills, Michigan, before Cam's second birthday. His younger sisters were both born in the U.S. Fowler attended Farmington High School, where he played baseball in addition to ice hockey. He also played travel baseball for the South Farmington Blues and had great potential to be a Division One College pitcher.

As a youth, Fowler played in the 2004 Quebec International Pee-Wee Hockey Tournament with the Detroit Honeybaked minor ice hockey team. Describing himself as being one of the weaker players on the team as a youth, Fowler's potential as a hockey player did not emerge until his teenage years.

Fowler was recruited by numerous National Collegiate Athletic Association (NCAA) Division I schools from age 14. He signed a National Letter of Intent with the University of Notre Dame in November 2008 during the early signing period. The USA Hockey National Team Development Program (USNTDP) also recruited him to their organization.

The Ontario Hockey League (OHL)'s Kitchener Rangers drafted Fowler with their first pick in the 2007 OHL Priority Selection; however, given that he had already committed to Notre Dame and playing in the OHL would have cost him his eligibility to play in the NCAA, Fowler refused to sign with the Rangers and instead made a two-year commitment to play for the USNTDP. With the development team, he was a member of the gold medal-winning American team at the 2009 IIHF World U18 Championships, where was named the best defenseman of the tournament and an all-star.

The Rangers surrendered his OHL rights at about the same time Fowler was reconsidering his commitment to play in the NCAA. The Windsor Spitfires then selected him with their first pick in the 2008 Priority Selection, after which he broke his agreement with Notre Dame and agreed to play for Windsor in the 2009–10 season. Fowler made the decision with the belief that playing in the OHL would better prepare him for an NHL career. The decision upset University officials, who alleged he was paid "under the table" by the OHL. Notre Dame Fighting Irish ice hockey team head coach Jeff Jackson alleged that the Rangers had offered Fowler a package worth $500,000 to break his commitment with Notre Dame and believed that Windsor had also made a financial offer to lure him away from the school. Fowler denied the accusations, stating he was "completely honest" with both Notre Dame and the Kitchener Rangers.

Fowler joined the Spitfires in 2009 and emerged as one of the top offensive-defensemen in the league, scoring 55 points in 55 games. He added 14 points in the playoffs to help lead Windsor to its second consecutive J. Ross Robertson Cup championship. The Spitfires then won the 2010 Memorial Cup as Canadian Hockey League (CHL) champions. Fowler left the Spitfires briefly during the season to play with the U.S. at the 2010 World Junior Ice Hockey Championships, winning a gold medal after defeating Canada 6–5 in overtime in the championship game.