The 2003 Grand Prix de Tennis de Lyon was a men's tennis tournament played on indoor carpet courts at the Palais des Sports de Gerland in Lyon in France and was part of the International Series of the 2003 ATP Tour. It was the 17th edition of the tournament and ran from October 6 through October 12, 2003. Rainer Schüttler won the singles title.
Rainer Schüttler defeated Arnaud Clément 7–5, 6–3
- It was Schüttler's 2nd title of the year and the 5th of his career.
Jonathan Erlich / Andy Ram defeated Julien Benneteau / Nicolas Mahut 6–1, 6–3
- It was Erlich's 2nd title of the year and the 3rd of his career. It was Ram's 3rd title of the year and the 3rd of his career.