| Image Coa: | DEU Untersteinach COA.svg |
| Coordinates: | 50.1167°N 42°W |
| Image Plan: | Untersteinach in KU.svg |
| State: | Bayern |
| Region: | Oberfranken |
| District: | Kulmbach |
| Verwaltungsgemeinschaft: | Untersteinach |
| Elevation: | 333 |
| Area: | 11.42 |
| Postal Code: | 95369 |
| Area Code: | 09225 |
| Licence: | KU |
| Gemeindeschlüssel: | 09 4 77 159 |
| Divisions: | 3 Ortsteile |
| Website: | www.untersteinach.de |
| Mayor: | Volker Schmiechen[1] |
| Leader Term: | 2020 - 26 |
| Party: | SPD |
Untersteinach is a municipality in the district of Kulmbach in Bavaria in Germany.
Untersteinach is arranged in the following boroughs:
left|thumb|Old stone bridge over the Untere Steinach river