| Merkenfritzerbach | |
| Mouth Location: | Nidder |
| Mouth Coordinates: | 50.3928°N 9.1344°W |
| Subdivision Type1: | Country |
| Subdivision Type2: | States |
| Tributaries Right: | Gänsbach |
Merkenfritzerbach is a small river of Hesse, Germany. It flows into the Nidder in Hirzenhain.