Markus Dieckmann (born 7 January 1976 in Bonn) is a retired professional beach volleyball player from Germany who represented his native country at the 2004 Summer Olympics in Athens, Greece.

There he ended up in ninth place in the overall-rankings.

Partnering with Jonas Reckermann he twice won the gold medal at the European Beach Volleyball Championships, in 2002 and 2004.

His twin brother, Christoph Dieckmann, also played as a professional beach volleyball player on the international tour.

This biographical article relating to volleyball in Germany is a stub.