Katerina Stewart (born July 17, 1997) is an American tennis player. Stewart has won 13 singles and five doubles titles on the ITF Women's Circuit. On July 27, 2015, she reached her best singles ranking of world No. 158. On July 30, 2018, she peaked at No. 400 in the doubles rankings. She made her WTA Tour debut at the 2014 US Open, having been handed a wildcard into the doubles tournament alongside Louisa Chirico. She enrolled at the West Point Preparatory School, starting the program in July 2016.