Ajla Tomljanović (/ˈaɪlə təmˈjɑːnəvɪtʃ/ EYE-lə təm-YAH-nə-vitch; Croatian: ; born 7 May 1993) is a Croatian-Australian professional tennis player. She has won four singles and three doubles titles on the ITF Circuit. On 21 February 2022, she reached a career-high singles ranking of world No. 38. On 5 January 2015, she peaked at No. 47 in the doubles rankings. Tomljanović was an accomplished junior player, having won the 2009 Australian Open girls' doubles title with Christina McHale. She reached a combined career-high junior ranking of world No. 4, on 30 March 2009.
Before 2014, Tomljanović played for her country of birth, Croatia. She began competing for Australia at the 2014 US Open after obtaining permanent residency in Australia. For the next four years she was required to represent Croatia at all non-Grand Slam events, until she was granted Australian citizenship in January 2018, allowing her to represent the country at all events on the WTA Tour.