The 2003 Gerry Weber Open was a men's tennis tournament played on grass courts at the Gerry Weber Stadion in Halle, North Rhine-Westphalia in Germany that was part of the International Series of the 2003 ATP Tour. It was the 11th edition of the tournament and was held from 9 June until 15 June 2003. First-seeded Roger Federer won the singles title.
See main article: 2003 Gerry Weber Open – Singles. Roger Federer defeated Nicolas Kiefer 6–1, 6–3
See main article: 2003 Gerry Weber Open – Doubles. 
Jonas Björkman / 
Todd Woodbridge defeated 
Martin Damm / Cyril Suk 6–3, 6–4