| Olga Modrachová | |
| Nationality: | Czech |
| Sport: | Athletics |
| Event: | High jump |
| Birth Date: | 9 May 1930 |
| Birth Place: | Prague, Czechoslovakia |
| Death Place: | Brno, Czech Republic |
Olga Modrachová, married Davidová (9 May 1930 - 30 January 1995) was a Czech athlete. She competed in the women's high jump at the 1952 Summer Olympics and the 1956 Summer Olympics.[1]
Her husband was Jiří David, a Czech sprinter.[2]