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.

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