| 1: | 2012 |
| 2: | Gerry Weber Open |
| Date: | 11–17 June |
| Edition: | 20th |
| Surface: | Grass / outdoor |
| Category: | ATP World Tour 250 |
| Draw: | 28S / 16D |
| Prize Money: | €663,750 |
| Location: | Halle, Germany |
| Venue: | Gerry Weber Stadion |
| Champs: | Tommy Haas |
| Champd: |  Aisam-ul-Haq Qureshi / Jean-Julien Rojer |
The 2012 Gerry Weber Open was a men's tennis tournament played on outdoor grass courts. It was the 20th edition of the event known that year as the Gerry Weber Open and is part of the ATP World Tour 250 series of the 2012 ATP World Tour. It took place at the Gerry Weber Stadion in Halle, Germany, between 11 June and 17 June 2012.[1] Unseeded Tommy Haas won the singles title.
The following players received wildcards into the singles main draw:
The following players received entry from the qualifying draw:
Gaël Monfils (right knee injury)
Kei Nishikori (stomach injury)| Country | Player | Country | Player | Rank1 | Seed | |
|---|---|---|---|---|---|---|
| Pakistan | Aisam-ul-Haq Qureshi | Jean-Julien Rojer | 49 | 1 | ||
| František Čermák | Julian Knowle | 70 | 2 | |||
| Dustin Brown | Oliver Marach | 74 | 3 | |||
 Spain | Marcel Granollers | Rafael Nadal | 81 | 4 |
The following pairs received wildcards into the doubles main draw:
Marcel Granollers (right ankle strain)See main article: 2012 Gerry Weber Open – Singles. Tommy Haas defeated Roger Federer, 7–6(7–5), 6–4
See main article: 2012 Gerry Weber Open – Doubles. Aisam-ul-Haq Qureshi / Jean-Julien Rojer defeated Treat Conrad Huey / 
Scott Lipsky, 6–3, 6–4
