2006 Gerry Weber Open – Singles

Roger Federer was the three-time defending champion, and won in the final 6–0, 6–7(4–7), 6–2, against Tomáš Berdych. Federer extended his tournament record by winning a fourth consecutive title in Halle. He also equalled Björn Borg's record of 41 consecutive match wins on grass.

Seeds
• # Roger Federer (champion)

• # 🇩🇪 Nicolas Kiefer (withdrew due to a wrist injury)

• # 🇫🇮 Jarkko Nieminen (second round)

• # 🇨🇾 Marcos Baghdatis (first round)

• # 🇨🇿 Tomáš Berdych (final)

• # 🇩🇪 Tommy Haas (semifinals)

• # 🇧🇪 Olivier Rochus (quarterfinals)

• # 🇧🇪 Kristof Vliegen (semifinals)