Isabelle Harle (born 1988) is a world-class distance freestyle and professional marathon swimmer from Germany. She is ranked in the FINA 10K Marathon Swimming World Cup pro circuit. She participated in the 2011 FINA World Championships in in Shanghai, China earning a bronze medal in the 5 km team pursuit event together with Thomas Lurz and Jan Wolfgarten.
- 3rd at the 2011 World Swimming Championships in the 5K Team Time Trial
- 16th at the 2011 World Swimming Championships in the 5K
- 2nd at the 2013 FINA 10K Marathon Swimming World Cup in Eilat, Israel