2004 Gerry Weber Open
Date	7–14 June
Edition	12th
Category	International Series
Draw	32S / 16D
Prize money	$767,000
Surface	Grass / outdoor
Location	Halle, Germany
Venue	Gerry Weber Stadion
Champions
Singles
Roger Federer[1]
Doubles
Leander Paes / David Rikl[2]
← 2003 · Gerry Weber Open · 2005 →

The 2004 Gerry Weber Open was a men's tennis tournament played on outdoor grass courts. It was the 12th edition of the Gerry Weber Open, and was part of the International Series of the 2004 ATP Tour. It took place at the Gerry Weber Stadion in Halle, North Rhine-Westphalia, Germany, from 7 June through 14 June 2004. First-seeded Roger Federer won his second consecutive singles title at the event.

Finals

Singles

Roger Federer defeated Mardy Fish 6–0, 6–3

• It was Federer's 5th title of the year, and his 22nd overall. It was his 2nd consecutive win at the event.

Doubles

Leander Paes / David Rikl defeated Tomáš Cibulec / Petr Pála 6–2, 7–5

• It was Paes' first title of the year and the 29th of his career. It was Rikl's first title of the year and the 22nd of his career.