Katharina Melissa Lehnert (born 18 February 1994) is a Filipino-German former 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.

In her career, she won four singles titles and three doubles titles on the ITF Circuit.

Playing for Philippines Fed Cup team, Lehnert scored a win–loss record of 15–10.