Olga Beresnyeva (, ; born 12 October 1985 in Zhdanov), is an Olympic and national-record holding distance swimmer for Ukraine. She also competed for Israel between 2004 and 2010, before returning to her native Ukraine.
Career
She has swum at the: Olympics: 2000, 2004, 2012 World Championships: 2003, 2005, 2009, 2011, 2013 European Championships: 2010 Open Water Worlds: 2008, 2010
She swam for Ukraine at her first Olympic Games in 2000, at the age of 14; and at her second Olympics in 2004.
At the 2003 World Championships, she set the Ukraine Record in the 1500 free (16:27.76).
After the 2004 Olympics, she change sport nationality to Israel. After failing to qualify for the 2008 Olympics, Beresnyeva returned to Ukraine.
Originally a distance swimmer in the pool, she began swimming open water races in 2008. Beresnyeva won the 25K race at the 2010 European Championships, the first time she swam the race.
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.