Olga Beresnyeva (Ukrainian: Ольга Береснєва, Hebrew: אולגה ברנסייבה; born 12 October 1985[1]),[2] is an Olympic and national-record holding distance swimmer for Ukraine.

At the 2003 World Championships, she set the Ukraine Record in the 1500 free (16:27.76).

[3] After failing to qualify for the 2008 Olympics, Beresnyeva returned to Ukraine.

[2][4] Originally a distance swimmer in the pool, she began swimming open water races in 2008.

[5] She swam in her third Olympics in 2012, swimming the Open Water event, but was disqualified and excluded from the Games by the IOC in June 2015 after re-analysis of a drug test showed she had been doping.