| Image Coa: | DEU Untersiemau COA.svg |
| Coordinates: | 50.1942°N 10.9731°W |
| Image Plan: | Untersiemau in CO.svg |
| State: | Bayern |
| Region: | Oberfranken |
| District: | Coburg |
| Elevation: | 299 |
| Area: | 20.49 |
| Postal Code: | 96253 |
| Area Code: | 09565 |
| Licence: | CO |
| Gemeindeschlüssel: | 09 4 73 170 |
| Website: | www.untersiemau.de |
| Mayor: | Rolf Rosenbauer[1] |
| Leader Term: | 2020 - 26 |
| Party: | CSU |
Untersiemau is a municipality in the district of Coburg in Bavaria in Germany.
Untersiemau lies about 10 kilometres (6.2 miles) south of Coburg at the eastern edge of Itz Valley.
Untersiemau is divided into 9 Ortsteile:
Untersiemau was first mentioned about 800 as Suome, the name is of Slavic origin.[2]
Untersiemau can be reached by car via motorway A 73 Suhl-Coburg-Nuremberg. Untersiemau used to have a station at the Itz Valley Railway, which was lifted in 2005.