Nadezhda Viktorovna Petrova (Надежда Викторовна Петрова; born June 8, 1982, in Moscow, Soviet Union) is a Russian professional tennis player.
Overall, she has won 31 WTA Titles, twelve in singles and nineteen in doubles. In singles, Petrova has reached a career-high ranking of world no. 3 in May 2006 and has reached the semifinals of the French Open in 2003 and 2005. In doubles, she won the year-ending Sony Ericsson Championships in 2004 with Meghann Shaughnessy, and in 2012 with Maria Kirilenko. As of 26 November 2012 (2012 -11-26), Petrova is ranked world no. 12 in singles and world no. 5 in doubles.