Olga Beliaeva or Olga Fomicheva (born 18 March 1985) is a Russian water polo player. At the 2008 and 2012 Summer Olympics, she competed for the Russia women's national water polo team in the women's event. She is 1.73 m (5 ft 8 in) tall. She won the gold medal at the 2006 European Championship in Belgrade, Serbia. She holds the title of Honoured Master of Sport in the Russian Federation.