The 2004 BellSouth Open was a men's tennis tournament played on outdoor clay courts in Viña del Mar in Chile and was part of the International Series of the 2004 ATP Tour. It was the eleventh edition of the tournament and ran from February 9 through February 15, 2004. Fernando González won the singles title.
Fernando González defeated Gustavo Kuerten 7–5, 6–4
- It was González's 1st title of the year and the 4th of his career.
Juan Ignacio Chela / Gastón Gaudio defeated Nicolás Lapentti / Martín Rodríguez 7–6(7–2), 7–6(7–3)
- It was Chela's 1st title of the year and the 3rd of his career. It was Gaudio's 1st title of the year and the 3rd of his career.