| Dieter Grahn | |
| Birth Date: | 20 March 1944 |
| Birth Place: | Zobten, Silesia, Germany |
| Sport: | Rowing |
Dieter Grahn (born 20 March 1944) is a German rower who competed for East Germany in the 1968 Summer Olympics and in the 1972 Summer Olympics.
He was born in Zobten, Silesia, Germany (today in Poland). In 1968 he was a crew member of the East German boat which won the gold medal in the coxless four event. Four years later he won his second gold medal with the East German boat in the coxless four event.