| Date: | 27 July – 2 August |
| Edition: | 109th |
| Surface: | Clay / outdoor |
| Category: | ATP World Tour 500 |
| Prize Money: | €1,285,955 |
| Draw: | 32S / 16D |
| Location: | Hamburg, Germany |
| Venue: | Am Rothenbaum |
| Champs: |  Rafael Nadal[1] |
| Champd: |  Jamie Murray /  John Peers[2] |
| Before Name: | International German Open |
| Main Name: | German Open Tennis Championships |
The 2015 German Open (also known as the bet–at–home Open 2015 for sponsorship reasons) was a men's tennis tournament played on outdoor red clay courts. It was the 109th edition of the German Open and part of the ATP World Tour 500 series of the 2015 ATP World Tour. It took place at the Am Rothenbaum in Hamburg, Germany, from 27 July through 2 August 2015. First-seeded Rafael Nadal won the singles title.
| Event | W | F | SF | QF | Round of 16 | Round of 32 | width=85 | Q | width=85 | Q2 | width=85 | Q1 |
| Singles[3] | 500 | 300 | 180 | 90 | 45 | 0 | 20 | 10 | 0 | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubles | 0 |
| width=130 bgcolor=dfe2e9 | Event | width=80 bgcolor=lime | W | width=85 bgcolor=thistle | F | width=85 bgcolor=ffff00 | SF | width=85 bgcolor=ffebcd | QF | width=85 bgcolor=afeeee | Round of 16 | width=85 bgcolor=afeeee | Round of 32 | width=85 | Q2 | width=85 | Q1 |
| style=background:#ededed | Singles | €311,755 | €140,560 | €66,580 | €32,130 | €16,380 | €9,010 | €1,015 | €560 | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| style=background:#ededed | Doubles | €84,970 | €38,340 | €18,080 | €8,740 | €4,470 |
| Country | Player | Rank1 | Seed | |
|---|---|---|---|---|
| Spain | Rafael Nadal | 10 | 1 | |
| Spain | Tommy Robredo | 21 | 2 | |
| Spain | Roberto Bautista Agut | 22 | 3 | |
 Italy | Andreas Seppi | 24 | 4 | |
| Pablo Cuevas | 25 | 5 | ||
 Argentina | Juan Mónaco | 27 | 6 | |
| Spain | Guillermo García López | 28 | 7 | |
| Italy | Fabio Fognini | 32 | 8 |
The following players received wildcards into the singles main draw:
The following players received entry from the qualifying draw:
David Ferrer →replaced by 
Benoît Paire Gilles Simon →replaced by Aljaž Bedene Simone Bolelli (gastroenteritis) Guillermo García López (hamstring injury)| Country | Player | Country | Player | Rank1 | Seed | |
|---|---|---|---|---|---|---|
| Italy | Simone Bolelli | Italy | Fabio Fognini | 18 | 1 | |
 Austria | Alexander Peya |  Brazil | Bruno Soares | 34 | 2 | |
| United Kingdom | Jamie Murray | Australia | John Peers | 39 | 3 | |
| Pablo Cuevas | Spain | David Marrero | 52 | 4 |
The following pairs received wildcards into the doubles main draw:
The following pair received entry from the qualifying draw:
Simone Bolelli (gastroenteritis) Guillermo García López (hamstring injury)See main article: 2015 German Open – Singles.
Rafael Nadal defeated Fabio Fognini, 7–5, 7–5See main article: 2015 German Open – Doubles.
Jamie Murray / John Peers defeated. 
Juan Sebastián Cabal / Robert Farah, 2–6, 6–3, [10–8]