| Headercolor: | lightblue |
| Olesya Velichko | |
| Fullname: | Olesya Yuryevna Velichko |
| Birth Date: | 20 May 1981 |
| Birth Place: | Taraz, Kazakhstan |
| Weight: | 500NaN0 |
| Sport: | Modern pentathlon |
| Club: | Dynamo Moskva |
| Show-Medals: | yes |
Olesya Yuryevna Velichko (Russian: Олеся Юрьевна Величко; born May 20, 1981, in Taraz, Kazakhstan) is a modern pentathlete from Russia.[1] She is a multiple-time medalist at the World Championships, and a double champion at the 2001 Junior World Championships.
Velichko competed at the 2004 Summer Olympics in Athens, Greece, where she finished seventeenth in the women's event, with a score of 5,016 points.