| Image Coa: | DEU Jachenau COA.svg |
| Coordinates: | 47.6°N 37°W |
| Image Plan: | Jachenau in TÖL.svg |
| State: | Bayern |
| Region: | Oberbayern |
| District: | Bad Tölz-Wolfratshausen |
| Elevation: | 790 |
| Area: | 128.63 |
| Postal Code: | 83676 |
| Area Code: | 08043 |
| Licence: | TÖL |
| Gemeindeschlüssel: | 09 1 73 131 |
| Website: | www.jachenau.de |
| Mayor: | Nikolaus Rauchenberger[1] |
| Leader Term: | 2020 - 26 |
| Party: | FW |
Jachenau is a municipality in the district of Bad Tölz-Wolfratshausen in Bavaria in Germany.