The 2004 Chennai Open was a men's tennis tournament played on outdoor hard courts at the SDAT Tennis Stadium in Chennai in India, part of the International Series of the 2004 ATP Tour. It ran from 5 January through 11 January 2004. First-seeded Carlos Moyá won the singles title while Rafael Nadal and Tommy Robredo took the doubles.
Finals
Singles
Template:Main Template:Flagicon Carlos Moyá defeated Template:Flagicon Paradorn Srichaphan 6–4, 3–6, 7–6(7–5)
- It was Moyá's 1st title of the year and the 14th of his career.
Doubles
Template:Main Template:Flagicon Rafael Nadal / Template:Flagicon Tommy Robredo defeated Template:Flagicon Jonathan Erlich / Template:Flagicon Andy Ram 7–6(7–3), 4–6, 6–3
- It was Nadal's 1st title of the year and the 2nd of his career. It was Robredo's 1st title of the year and the 2nd of his career.