| Type: | Ortsgemeinde |
| Image Coa: | DEU Mittelfischbach COA.svg |
| Coordinates: | 50.2544°N 7.9622°W |
| Image Plan: | Mittelfischbach in EMS.svg |
| State: | Rheinland-Pfalz |
| District: | Rhein-Lahn-Kreis |
| Verbandsgemeinde: | Aar-Einrich |
| Elevation: | 358 |
| Area: | 1.84 |
| Postal Code: | 56370 |
| Area Code: | 06486 |
| Licence: | EMS, DIZ, GOH |
| Gemeindeschlüssel: | 07 1 41 088 |
| Mayor: | Werner Großheim[1] |
| Leader Term: | 2019 - 24 |
Mittelfischbach is a municipality in the district of Rhein-Lahn, in Rhineland-Palatinate, in western Germany. It belongs to the association community of Aar-Einrich.