| Date: | 8–16 June |
| Edition: | 21st |
| Category: | ATP World Tour 250 |
| Draw: | 28S / 16D |
| Surface: | Grass |
| Prize Money: | €683,665 |
| Location: | Halle, Germany |
| Venue: | Gerry Weber Stadion |
| Champs: | Roger Federer[1] |
| Champd: |  Santiago González /  Scott Lipsky[2] |
The 2013 Gerry Weber Open was a men's tennis tournament played on outdoor grass courts. It was the 21st edition of the event known that year as the Gerry Weber Open and was part of the ATP World Tour 250 series of the 2013 ATP World Tour. It took place at the Gerry Weber Stadion in Halle, Germany, between 8 June and 16 June 2013. First-seeded Roger Federer won his sixth singles title at the event..[3]
| Country | Player | Rank1 | Seed | |
|---|---|---|---|---|
| Roger Federer | 3 | 1 | ||
 France | Richard Gasquet | 9 | 2 | |
| Tommy Haas | 14 | 3 | ||
 Japan | Kei Nishikori | 15 | 4 | |
 Canada | Milos Raonic | 16 | 5 | |
| Philipp Kohlschreiber | 19 | 6 | ||
 Poland | Jerzy Janowicz | 23 | 7 | |
| Florian Mayer | 30 | 8 |
The following players received wildcards into the singles main draw:
The following players received entry from the qualifying draw:
The following player received entry as a lucky loser:
Paolo Lorenzi
Rafael Nadal (fatigue) Andreas Seppi
Janko Tipsarević| Country | Player | Country | Player | Rank1 | Seed | |
|---|---|---|---|---|---|---|
 Pakistan | Aisam-ul-Haq Qureshi | Jean-Julien Rojer | 19 | 1 | ||
 Austria | Julian Knowle |  Romania | Horia Tecău | 36 | 2 | |
| Mexico | Santiago González | Scott Lipsky | 48 | 3 | ||
| Treat Conrad Huey |  United Kingdom | Dominic Inglot | 62 | 4 |
The following pairs received wildcards into the doubles main draw:
Mikhail Youzhny, 6–7(5–7), 6–3, 6–4See main article: 2013 Gerry Weber Open – Doubles.
Santiago González / Scott Lipsky defeated Daniele Bracciali / 
Jonathan Erlich, 6–2, 7–6(7–3)
