Aleksandra Wozniak (born September 7, 1987, in Montreal, Quebec, Canada) is a professional Canadian tennis player of Polish heritage. Wozniak is Canada's highest-ranked women's singles player at #32 in the world (September 21, 2009), and the 4th-highest ranked Canadian singles player of all time. She has won one WTA and seven ITF tournaments, and is the only Québécoise ever to have won a WTA tournament.

Wozniak speaks six languages, having learned Polish first. She has been coached since she was 3 years old by her Polish-born father,, Antoni, a former pro soccer player whose "day" job is that of a truck inspector. Her older sister, Dorota, was the No. 1 player in Canada in the 14-and-unders and the 16-and-unders, and 2-time NCAA champion for San Diego State.

In 2002, as a 14-year-old, Wozniak won the Canadian Indoors Under-16 and Under-18 championships. Aleksandra won the Kentucky International Junior Tennis Derby in 2004. In 2005, Wozniak reached #3 in the juniors. She also won the Tevlin Challenger 25K tournament in Toronto, the Hamilton Challenger 25K in Canada, the Victoria Challenger 25K and the Junior Casablanca Cup (as well as the doubles) in Mexico, and the Junior Del Cafe Cup (as well as the doubles) in Costa Rica.