| Champ: |  Ken Rosewall |
| Runner: | Karl Meiler |
| Score: | 6–4, 6–4, 6–3 |
| Type: | singles doubles |
| Draw: | 32 |
| Seeds: | 2 |
| Main Name: | Swiss Open (tennis) Swiss Open |
The 1975 Suisse Open Gstaad – Singles was an event of the 1975 Suisse Open Gstaad tennis tournament and was played on outdoor red clay courts in Gstaad, Switzerland from 7 July until 13 July 1975. The draw comprised 32 players and two of them were seeded. Guillermo Vilas was the defending Swiss Open singles champion but lost in the semifinals. First-seeded Ken Rosewall won the title by defeating unseeded Karl Meiler in the final, 6–4, 6–4, 6–3.[1] [2] [3]