Michael Rensing (born 14 May 1984 in Lingen, Lower Saxony) is a German footballer who currently plays for 1. FC Köln.

Born of a German father and a Serbian mother, Rensing joined Bayern in 2000 from TuS Lingen, and went on to develop his talent in the club's youth sides.

He spent the 2002–03 season in the German Regionalliga with Bayern's reserve side, and won a place in the UEFA Champions League squad at the start of the following campaign as he moved up the Bayern pecking order to become Oliver Kahn's deputy.

Rensing made his Bundesliga debut on 21 February 2004, playing the entire 90 minutes of the 1–0 home win against Hamburg. He also kept a clean sheet in his second match against Schalke 04.

Rensing saw action in six Bundesliga games in the 2005–06 season, and saw his first Champions League nod for an injured Oliver Kahn against Milan on 21 February 2006 (Milan keeper Dida was injured during the match, so both sides finished with reserve goalkeepers in goal), which ended in a 1–1 draw. On 15 April 2006, Rensing was involved in a strange incident prior to a match against Arminia Bielefeld. He took a warm-up shot that struck goalkeeper Oliver Kahn blackening his eye and forcing him to sit out the game. Rensing played in Kahn's place and Bayern went on to win the contest 2–0.