Leonie Küng (born 21 October 2000) is a Swiss tennis player. As a qualifier, she reached the singles final at the Junior Wimbledon Championships in 2018. Küng has career-high WTA rankings of 144 in singles, achieved on 14 September 2020, and 220 in doubles, reached on 26 July 2021. To date, she has won one doubles WTA Challenger title with five singles titles and two doubles titles on the ITF Circuit.