Xenia Knoll (; born 2 September 1992) is a Swiss former tennis player.
Knoll won two doubles titles on the WTA Tour and one WTA 125 doubles title, as well as four singles and 32 doubles titles on the ITF Circuit. On 23 March 2015, she reached her career-high singles ranking of world No. 254. On 17 April 2017, she peaked at No. 40 in the WTA doubles rankings.
Knoll made her WTA Tour debut at the 2013 Budapest Grand Prix with a direct entry into the main draw, losing in straight sets to the former world-ranked No. 11, Shahar Pe'er of Israel.
Knoll made her debut for the Switzerland Fed Cup team in 2015.
She is of Serbian descent on her mother's side who is from Belgrade.