| Birth Place: | Bonn, West Germany |
| Height: | 6'2" |
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.