2004 Grand Prix de Tennis de Lyon
Date	4–11 October
Edition	18th
Category	International Series
Draw	32S / 16D
Prize money	$767,000
Surface	Carpet / indoor
Location	Lyon, France
Champions
Singles
Robin Söderling[1]
Doubles
Jonathan Erlich / Andy Ram[2]
← 2003 · Grand Prix de Tennis de Lyon · 2005 →

The 2004 Grand Prix de Tennis de Lyon was a men's tennis tournament played on indoor carpet courts. It was played at the Palais des Sports de Gerland in Lyon, France, and was part of the 2004 ATP Tour. It was the 18th edition of the tournament and took place from 4 October through 11 October 2004. Unseeded Robin Söderling won the singles title.

Finals

Singles

Robin Söderling defeated Xavier Malisse 6–2, 3–6, 6–4

• It was Söderling's only title of the year and the 1st of his career.

Doubles

Jonathan Erlich / Andy Ram defeated Jonas Björkman / Radek Štěpánek 7–6^(7–2), 6–2

• It was Erlich's only title of the year and the 4th of his career. It was Ram's only title of the year and the 4th of his career.