Caroline Wozniacki (born 11 July 1990, Odense) is a Danish tennis player. She achieved her current and career-high singles ranking of World No. 4 on 26 October 2009. She is the only Danish woman currently in the Top 300 on the WTA Tour. She has won 6 WTA Tour events and was the runner up at the 2009 US Open.

Wozniacki is the daughter of Polish parents, father Piotr and mother Anna. Piotr Wozniacki acts as her coach. She is from a very sports-oriented family. Her mother played on the Poland women's national volleyball team. Her father played football professionally in Poland (Miedź Legnica and Zagłębie Lubin), Germany, and they moved to Denmark when his contract was sold to a Danish club. Her older brother Patrik is a professional football player for BK Frem in Denmark.

Her closest friends on the tour are Agnieszka Radwanska and Urszula Radwanska. She is also good friends with Sabine Lisicki and Sorana Cirstea.