The 2004 Monte Carlo Masters was a men's tennis tournament played on outdoor clay courts. It was the 98th edition of the Monte Carlo Masters and was part of the Masters Series of the 2004 ATP Tour. It took place at the Monte Carlo Country Club in Roquebrune-Cap-Martin in France from 19 April through 25 April 2004. Third-seeded Guillermo Coria won the singles title.
See main article: 2004 Monte Carlo Masters – Singles. Guillermo Coria defeated Rainer Schüttler 6–2, 6–1, 6–3
See main article: 2004 Monte Carlo Masters – Doubles. Tim Henman / Nenad Zimonjić defeated Gastón Etlis / Martín Rodríguez 7–5, 6–2