| Headercolor: | lightblue |
| Blandine Lachèze | |
| Birth Date: | 11 October 1982 |
| Birth Place: | Fontainebleau, Seine-et-Marne |
| Weight: | 600NaN0 |
| Sport: | Modern pentathlon |
| Club: | Union Sportive Font Romeu Pentathlon |
| Show-Medals: | yes |
Blandine Lachèze (born October 11, 1982 in Fontainebleau, Seine-et-Marne) is a female modern pentathlete from France.[1] She competed at the 2004 Summer Olympics in Athens, Greece, where she finished nineteenth in the women's event, with a score of 4,988 points.
Lachèze won an individual gold medal at the 2003 Asian Open Championships in Kaohsiung, Chinese Taipei, and a relay bronze at the 2004 World Modern Pentathlon Championships in Moscow, Russia.