Dennis Marvin Seidenberg is a German former professional ice hockey defenceman who played in the National Hockey League (NHL) for the Philadelphia Flyers, Phoenix Coyotes, Carolina Hurricanes, Florida Panthers, New York Islanders, and Boston Bruins, with whom he won the Stanley Cup in 2011. His younger brother Yannic played for EHC Red Bull München in the DEL.

The 2011 Stanley Cup Finals was the championship series of the National Hockey League's (NHL) 2010–11 season, and the culmination of the 2011 Stanley Cup playoffs. The Eastern Conference champion Boston Bruins defeated the Western Conference champion Vancouver Canucks four games to three. The Bruins ended a 39-year Stanley Cup drought with the victory. Bruins goaltender Tim Thomas was awarded the Conn Smythe Trophy as the Most Valuable Player of the playoffs.