| Martonca River | |
| Martonka-patak | |
| River | |
| Countries | Romania |
|---|---|
| Counties | Harghita County |
| Tributaries | |
| - right | Lucaci |
| Villages | Făgețel, Martonca |
| Source | |
| - location | Gurghiu Mountains |
| Mouth | Mureș |
| - coordinates | 46°50′55″N 25°26′55″E / 46.8487°N 25.4486°ECoordinates: 46°50′55″N 25°26′55″E / 46.8487°N 25.4486°E |
| Progression | Mureș→ Tisza→ Danube→ Black Sea |
The Martonca River (Hungarian: Martonka-patak, from the name "Martin") is a left tributary of the river Mureș in Transylvania, Romania. It discharges into the Mureș near Subcetate.