Gustaf Wesslau (born February 5, 1985) is a Swedish professional ice hockey goaltender who is currently an unrestricted free agent.

He most recently played for Kölner Haie in the Deutsche Eishockey Liga (DEL).

He later played for other teams of the first and second division in Sweden, including the Malmö Redhawks, Almtuna IS, Borås HC and Djurgårdens IF.

[4] At the conclusion of his contract with HV71, having appeared in 132 regular season games as the club's starting goaltender, Wesslau left as a free agent to sign a one-year contract in Germany with Kölner Haie of the Deutsche Eishockey Liga (DEL) on March 26, 2015.

[6] He received 2016-17 DEL Regular Season Goaltender of the Year honors.