| Horst Assmy | |
| Fullname: | Horst Assmy |
| Birth Date: | 29 November 1933 |
| Birth Place: | Berlin, Germany |
| Death Place: | West Germany |
| Position: | Forward |
| Years1: | 1952–1953 |
| Clubs1: | Einheit Pankow |
| Years2: | 1953–1954 |
| Clubs2: | Motor Oberschöneweide |
| Years3: | 1954–1959 |
| Clubs3: | Vorwärts Berlin |
| Caps3: | 102 |
| Goals3: | 27 |
| Years4: | 1960–1961 |
| Clubs4: | Tennis Borussia Berlin |
| Years5: | 1961–1962 |
| Clubs5: | Schalke 04 |
| Caps5: | 20 |
| Goals5: | 9 |
| Years6: | 1962–1965 |
| Clubs6: | Hessen Kassel |
| Caps6: | 51 |
| Goals6: | 10 |
| Nationalyears1: | 1954–1959 |
| Nationalteam1: | East Germany |
| Nationalcaps1: | 12 |
| Nationalgoals1: | 4 |
Horst Assmy (29 November 1933 – 14 January 1972) was a German footballer who played as a forward. Assmy played in East Germany for Einheit Pankow, Motor Oberschöneweide and Vorwärts Berlin, and won 12 caps for the national team, scoring 4 goals. He defected as a republikflucht to West Germany in 1959,[1] appearing for Tennis Borussia Berlin, Schalke 04 and Hessen Kassel.