| Horst Hagen | |
| Nationality: | German |
| Birth Date: | 1950 1, df=yes |
| Birth Place: | Kuhsdorf, district Prignitz, East Germany |
Horst Hagen (born 10 January 1950) is a German former volleyball player who competed for East Germany in the 1972 Summer Olympics.
He was born in Kuhsdorf, district Prignitz.
In 1972 he was part of the East German team which won the silver medal in the Olympic tournament. He played four matches.