Maria Yuryevna Kirilenko-Stepanova (Russian: Мари́я Ю́рьевна Кириле́нко, IPA: ; born 25 January 1987) is a Russian tennis player. She won the 2002 US Open Girls' Singles and won her first WTA Tour title in 2005, defeating Anna-Lena Grönefeld in the China Open. She has reached three Grand Slam singles quarterfinals, at the 2010 Australian Open the 2012 Wimbledon Championships and the 2013 French Open. In doubles, she has reached two Grand Slam doubles finals, at the 2011 Australian Open and the 2012 French Open, won the 2012 WTA Tour Championships and was a bronze medalist at the 2012 London Olympics. In June 2013, Kirilenko reached her career high ranking of world No. 10.
In 2002, Kirilenko became one of the youngest winners of the Canadian Open and US Open junior tournaments.
In 2002, Kirilenko started participating in WTA events. She began moving up the rankings in 2004, but was set back by an injury. At the 2004 French Open, Kirilenko took the first set off Serena Williams before losing in three sets.