| Image Coa: | DEU Flacht COA.svg |
| Coordinates: | 50.3453°N 8.0503°W |
| Image Plan: | Flacht in EMS.svg |
| State: | Rheinland-Pfalz |
| District: | Rhein-Lahn-Kreis |
| Verbandsgemeinde: | Aar-Einrich |
| Elevation: | 125 |
| Area: | 4.45 |
| Postal Code: | 65558 |
| Area Code: | 06432 |
| Licence: | EMS, DIZ, GOH |
| Gemeindeschlüssel: | 07 1 41 043 |
| Website: | www.flacht-aar.de |
| Mayor: | Timo Schneider[1] |
| Leader Term: | 2019 - 24 |
| Party: | SPD |
Flacht is a municipality in the district of Rhein-Lahn, in Rhineland-Palatinate, in western Germany. It belongs to the association community of Aar-Einrich.