2011 International German Open

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.

*Seedings based on the July 12, 2011 rankings.

The following players received wildcards into the singles main draw:

The following players received entry from the qualifying draw:

The following players received entry from a lucky loser spot:

Gilles Simon defeated Nicolás Almagro, 6–4, 4–6, 6–4.

Oliver Marach / Alexander Peya defeated František Čermák / Filip Polášek, 6–4, 6–1.