Katharina Melissa Lehnert (born 18 February 1994) is an inactive Filipino-German tennis player. Lehnert has a German father and a Filipino mother; she represented Germany until 2013 when she decided to represent the Philippines. Lehnert has a career-high WTA singles ranking of No. 389, achieved on 22 April 2013. On 24 August 2015, she peaked at No. 451 of the doubles rankings. Lehnert has won four singles titles and three doubles titles on the ITF Circuit. Playing for Philippines Fed Cup team, Lehnert has a win–loss record of 15–10.