The Moselle Open (Open de Moselle from 2003 to 2010) is a professional tennis tournament held in the city of Metz and played on indoor hardcourts.

It is part of the ATP Tour 250 series of the ATP Tour from 2003.

The venue for the tournament is currently Les Arènes and was previously the Parc des Expositions de Metz Métropole from 2011 to 2013.

Since 2025, the tournament is one of the three French events of the ATP Tour 250 series, along with the Open Occitanie and the Open 13.

It was one of four with the Lyon Open until 2025.