Stefan Langwieder (born January 8, 1987) is a German professional ice hockey defender who currently plays for the Iserlohn Roosters of the Deutsche Eishockey Liga. He initially played for Adler Mannheim during the 2007 season before signing with the Iserlohn Roosters in 2008. On April 5, 2009, Langwieder was signed to a three-year extension to remain with Iserlohn.