2004 U.S. Men's Clay Court Championships
Date	April 12–18
Edition	36th
Category	International Series
Draw	32S / 16D
Prize money	$355,000
Surface	Clay / outdoor
Location	Houston, Texas, U.S.
Venue	Westside Tennis Club
Champions
Singles
Tommy Haas[1]
Doubles
James Blake / Mardy Fish[2]
← 2003 · U.S. Men's Clay Court Championships · 2005 →

The 2004 U.S. Men's Clay Court Championships was a tennis tournament played on outdoor clay courts at the Westside Tennis Club in Houston, Texas in the United States and was part of the International Series of the 2004 ATP Tour. It was the 36th edition of the tournament and was held from April 12 through April 18, 2004. Tommy Haas won the singles title.

Tommy Haas defeated Andy Roddick 6–3, 6–4

• It was Haas's 1st title of the year and the 6th of his career.

James Blake / Mardy Fish defeated Rick Leach / Brian MacPhie 6–3, 6–4

• It was Blake's 2nd title of the year and the 5th of his career. It was Fish's 2nd title of the year and the 4th of his career.

• Official website
• ATP tournament profile