Monica Niculescu (born 25 September 1987) is a Romanian tennis player. As of October 25, 2010 she is ranked No. 83 at the WTA Tour Singles Ranking. Her highest WTA rankings was No. 47 in singles, reached on 10 November 2008, and No. 24 in doubles, reached on June 7, 2010.
Niculescu was born in Slatina, Romania, but moved to Bucharest when she was four. She is currently coached by Calin Stelian Ciorbagiu.
Niculescu opened the season at the Brisbane International, where she lost to Tsvetana Pironkova in the first round, in three sets. She also lost in the first round of Moorilla Hobart International to Alyona Bondarenko. At the 2009 Australian Open, Niculescu beat Katie O'Brien in the first round (6—4, 6—4), before losing to Sara Errani in the second (6—2, 6—3). Alongside Sorana Cîrstea Niculescu was the fourteenth seed in women's doubles; they lost to Nathalie Dechy and Mara Santangelo in the second round, 6—3, 6—3.