| 2005 Allianz Suisse Open Gstaad | |
|---|---|
| Date | 4–10 July |
| Edition | 60th |
| Category | International Series |
| Draw | 32S / 16D |
| Prize money | $470,000 |
| Surface | Clay / outdoor |
| Location | Gstaad, Switzerland |
| Venue | Roy Emerson Arena |
| Champions | |
| Singles | |
 Gastón Gaudio | |
| Doubles | |
 František Čermák / Leoš Friedl | |
The 2005 Allianz Suisse Open Gstaad was a men's tennis tournament played on outdoor clay courts at the Roy Emerson Arena in Gstaad in Switzerland and was part of the International Series of the 2005 ATP Tour. It was the 60th edition of the tournament and was held from July 4 through July 10, 2004.