Klaus Mainzer (born 2 February 1979) is a German international rugby union player, playing for the TV Pforzheim in the Rugby-Bundesliga and the German national rugby union team.
He only played one game for the club in 2009-10 because of contract disputes.
On domestic level, he won two German championships with his club team in 2003 and 2004 against DRC Hannover and made losing appearances in the 2001 finals against DRC Hannover and again in 2006 against RG Heidelberg.
Not having played in SC Neuenheim's first team in 2010-11 because of disagreements with the clubs leadership, he joined newly promoted Bundesliga side TV Pforzheim for the 2011–12 season.
[1] Klaus Mainzer's personal statistics in club and international rugby:[2]