Markus Deibler (born 28 January 1990) is a German swimmer who competed at the 2008 and 2012 Olympics. In 2008 he finished in 40th place in the 200 m individual medley. In 2012 he was sixth in the 4×100 m freestyle and 4×100 m medley relays and eighth in the 200 m medley. He won three gold and two silver medals at the short-course European championships in 2010 and 2011.
His elder brother Steffen also competed in swimming at the 2008 and 2012 Olympics.