| Image Coa: | Wappen Gaissach.svg |
| Coordinates: | 47.75°N 46°W |
| Image Plan: | Gaißach in TÖL.svg |
| State: | Bayern |
| Region: | Oberbayern |
| District: | Bad Tölz-Wolfratshausen |
| Elevation: | 735 |
| Area: | 38.55 |
| Postal Code: | 83674 |
| Area Code: | 08041 und 08042 |
| Licence: | TÖL |
| Gemeindeschlüssel: | 09 1 73 124 |
| Website: | www.gaissach.de |
| Mayor: | Stefan Fadinger[1] |
| Leader Term: | 2020 - 26 |
| Party: | Independent |
Gaißach is a municipality in the district of Bad Tölz-Wolfratshausen in Bavaria in Germany.