2011 International German Open – Singles

The 2011 International German Open was the 105th edition of the International German Open, a men's tennis tournament held that year in Hamburg, Germany. Part of the ATP World Tour 500 series of the 2011 ATP World Tour, the games would last from 18 July through 24 July 2011. Andrey Golubev was the defending champion, but lost to Philipp Kohlschreiber in the first round.

Gilles Simon won in the final 6–4, 4–6, 6–4, against Nicolás Almagro.

Seeds
All seeds received a bye into the second round. • # 🇫🇷 Gaël Monfils (quarterfinals)

• # 🇦🇹 Jürgen Melzer (quarterfinals)

• # 🇪🇸 Nicolás Almagro (final)

• # 🇷🇺 Mikhail Youzhny (semifinals)

• # 🇫🇷 Gilles Simon (champion)

• # 🇩🇪 Florian Mayer (quarterfinals)

• # 🇦🇷 Juan Ignacio Chela (second round)

• # 🇪🇸 Fernando Verdasco (semifinals)

• # 🇷🇸 Janko Tipsarević (second round)

• # 🇺🇦 Alexandr Dolgopolov (second round)

• # 🇷🇺 Nikolay Davydenko (second round)

• # Marin Čilić (quarterfinals)

• # 🇮🇹 Andreas Seppi (second round)

• # 🇪🇸 Guillermo García López (second round)

• # 🇮🇹 Fabio Fognini (third round)

• # 🇪🇸 Albert Montañés (second round, retired)