Susi Fortun-Lohrmann (born 27 March 1973) is a German former professional tennis player.

Born in Sankt Georgen, Lohrmann was a right-handed player who competed on the professional tour in the 1990s and early 2000s.

Her best performance on the WTA Tour was a third round appearance Stratton Mountain in 1993, which included a win over the sixth seeded player Chanda Rubin.

Lohrmann, who lives in Leonberg, has been married to tennis player Martin Fortun since 2008.

[2] She is a highly ranked player on the ITF senior's circuit, currently competing in the 45 age group.