Rainer Köttstorfer (born 2 August 1981) is a former German professional ice hockey defenceman. He most recently played for Grizzly Adams Wolfsburg of the Deutsche Eishockey Liga (DEL).
On 9 February 2011, Köttstorfer signed a one-year extension with the Hamburg Freezers to remain through to the 2011–12 season. Upon completion of the season and as a free agent, Rainer signed a one-year contract with Grizzly Adams Wolfsburg on July 10, 2012. He only played 7 games before he retired as a result of an injury.