| Lucie Petit-Diagre | |
| Nationality: | Belgian |
| Sport: | Athletics |
| Event: | Discus throw |
| Birth Date: | 24 July 1901 |
| Birth Place: | Paris, France |
| Death Place: | Dilbeek, Belgium |
Lucie Petit-Diagre (24 July 1901 - 24 December 2001) was a Belgian athlete. She competed in the women's discus throw at the 1928 Summer Olympics.[1]