Karel Kolář (16 December 1955 – 4 October 2017) was a 400 metres runner from the Czech Republic, who represented Czechoslovakia. He won two medals at the European Indoor Championships and two at the 1978 European Championships. He established the Indoor World record (400 m / 46.21 sec) at European Indoor Championships in Vienna.
| 1978 | Prague, Czechoslovakia | 2nd | 400 m | ||
| Prague, Czechoslovakia | 3rd | 4 × 400 m relay, Josef Lomický, František Břečka, Miroslav Tulis, Karel Kolář | |||
| 1979 | Vienna, Austria | 1st | 400 m | ||
| 1980 | Sindelfingen, West Germany | 2nd | 400 m |