Karl Sebastien Dykhuis (/ˈdaɪkhaʊs/ DYKE-hows; born July 8, 1972) is a Canadian former professional ice hockey defenceman who played 12 seasons in the National Hockey League (NHL) for the Chicago Blackhawks, Philadelphia Flyers, Tampa Bay Lightning and Montreal Canadiens.

As a youth, he played in the 1985 and 1986 Quebec International Pee-Wee Hockey Tournaments with a minor ice hockey team from Sept-Îles, Quebec.

During the 2004–05 NHL lockout Dykhuis played for the Amsterdam Bulldogs Hockey Club in The Netherlands.^{[citation needed]}