Julia Mayr (born 12 August 1991) is a former Italian tennis player. She is the younger sister of former professional player Evelyn Mayr. Mayr won eight singles and 12 doubles titles on the ITF Circuit. On 20 September 2010, she reached her best singles ranking of world No. 215. On 29 August 2011, she peaked at No. 225 in the doubles rankings.