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| Medal record | ||
|---|---|---|
| Men's canoe slalom | ||
Representing  East Germany | ||
| World Championships | ||
 | 1957 Augsburg | C-2 |
| 1959 Geneva | C-2 |
| 1959 Geneva | C-2 team |
| 1961 Hainsberg | C-2 team |
 | 1955 Tacen | C-2 |
| 1955 Tacen | C-2 team |
 | 1957 Augsburg | C-2 team |
| 1961 Hainsberg | C-2 |
Horst Kleinert is a retired East German slalom canoeist who competed from the mid-1950s to the early 1960s. He won eight medals at the ICF Canoe Slalom World Championships with four golds (C-2: 1957, 1959; C-2 team: 1959, 1961), two silvers (C-2: 1955, C-2 team: 1955) and a bronze (C-2: 1961, C-2 team: 1957).
