The 2015 Swiss Open Gstaad presented by Visilab was a men's tennis tournament played on outdoor clay courts. It was the 48th edition of the Swiss Open, and part of the ATP World Tour 250 Series of the 2015 ATP World Tour. It took place at the Roy Emerson Arena in Gstaad, Switzerland, from 27 July through 2 August 2015. Third-seeded Dominic Thiem won the singles title.
| Country | Player | Rank1 | Seed | |
|---|---|---|---|---|
 Belgium | David Goffin | 14 | 1 | |
 Spain | Feliciano López | 19 | 2 | |
 Austria | Dominic Thiem | 26 | 3 | |
| Spain | Pablo Andújar | 35 | 4 | |
 Brazil | Thomaz Bellucci | 41 | 5 | |
| João Sousa | 51 | 6 | ||
| Spain | Pablo Carreño Busta | 56 | 7 | |
 Colombia | Santiago Giraldo | 59 | 8 |
The following players received wildcards into the singles main draw:
The following players received entry from the qualifying draw:
| Country | Player | Country | Player | Rank1 | Seed | |
|---|---|---|---|---|---|---|
| Spain | Marcel Granollers | Spain | Marc López | 29 | 1 | |
| Mariusz Fyrstenberg |  Mexico | Santiago González | 99 | 2 | ||
| Austria | Oliver Marach |  Pakistan | Aisam-ul-Haq Qureshi | 105 | 3 | |
| Austria | Julian Knowle | Austria | Philipp Oswald | 119 | 4 |
The following pairs received wildcards into the doubles main draw:
See main article: 2015 Swiss Open Gstaad – Singles.
Dominic Thiem defeated David Goffin, 7–5, 6–2See main article: 2015 Swiss Open Gstaad – Doubles.
Aliaksandr Bury / 
Denis Istomin defeated Oliver Marach / Aisam-ul-Haq Qureshi, 3–6, 6–2, [10–5]
