| Date: | 18–24 July |
| Edition: | 105th |
| Category: | ATP World Tour 500 |
| Prize Money: | €1,000,000 |
| Draw: | 48S / 16D |
| Surface: | Clay / Outdoor |
| Location: | Hamburg, Germany |
| Champs: |  Gilles Simon[1] |
| Champd: |  Oliver Marach / Alexander Peya[2] |
The 2011 International German Open (also known as the bet–at–home Open – German Tennis Championships 2011 for sponsorship reasons) was a men's tennis tournament played on outdoor red clay courts. It was the 105th edition of the event known that year as the International German Open and was part of the ATP World Tour 500 series of the 2011 ATP World Tour. It took place at the Am Rothenbaum in Hamburg, Germany, from 18 July through 24 July 2011.
| Nation | Player | Ranking* | Seeding |
|---|---|---|---|
| France | Gaël Monfils | 7 | 1 |
| Austria | Jürgen Melzer | 12 | 2 |
 Spain | Nicolás Almagro | 14 | 3 |
 Russian Federation | Mikhail Youzhny | 17 | 4 |
| France | Gilles Simon | 18 | 5 |
| Florian Mayer | 20 | 6 | |
 Argentina | Juan Ignacio Chela | 21 | 7 |
| Spain | Fernando Verdasco | 22 | 8 |
 Serbia | Janko Tipsarević | 23 | 9 |
 Ukraine | Alexandr Dolgopolov | 26 | 10 |
| Russian Federation | Nikolay Davydenko | 29 | 11 |
| Marin Čilić | 32 | 12 | |
 Italy | Andreas Seppi | 37 | 13 |
| Spain | Guillermo García-López | 38 | 14 |
| Italy | Fabio Fognini | 39 | 15 |
| Spain | Albert Montañés | 41 | 16 |
The following players received wildcards into the singles main draw:
The following players received entry from the qualifying draw:
See main article: 2011 International German Open – Singles qualifying.
The following players received entry from a lucky loser spot:
See main article: 2011 International German Open – Singles. Gilles Simon defeated Nicolás Almagro, 6–4, 4–6, 6–4.
See main article: 2011 International German Open – Doubles. Oliver Marach / Alexander Peya defeated 
František Čermák / 
Filip Polášek, 6–4, 6–1.
