| Horst Rittner | |
|---|---|
 Rittner in 2008 | |
| Full name | Horst Robert Rittner |
| Country | Germany |
| Born | 16 July 1930 Breslau, Germany (today Wrocław, Poland) |
| Died | 14 June 2021 (aged 90) |
| Title | ICCF Grandmaster (1961) |
| ICCF World Champion | 1968–1971 |
Horst Robert Rittner (16 July 1930 – 14 June 2021) was a German correspondence chess Grandmaster. He was born in Breslau, Weimar Germany, and was the sixth ICCF World Champion, between 1968 and 1971. He also edited the German magazine Schach.
