The 2004 Open de Moselle was a men's tennis tournament played on indoor hard courts. It was the second edition of the Open de Moselle, and was part of the International Series of the 2004 ATP Tour. It took place at the Arènes de Metz in Metz, France from 11 October until 17 October 2004. Unseeded Jérôme Haehnel, who entered the main draw as a qualifier, won the singles title.
See main article: 2004 Open de Moselle – Singles. 
Jérôme Haehnel defeated Richard Gasquet 7–6(11–9), 6–4
See main article: 2004 Open de Moselle – Doubles. Arnaud Clément / Nicolas Mahut defeated Ivan Ljubičić / 
Uros Vico 6–2, 7–6(10–8)