| Matalag River | |
| Name Other: | Wangag yo Matalag, Ilog ng Matalag |
| Pushpin Map: | Luzon mainland#Philippines |
| Pushpin Map Caption: | Matalag River mouth |
| Subdivision Type1: | Country |
| Subdivision Name1: | Philippines |
| Subdivision Type2: | Region |
| Subdivision Name2: | Cagayan Valley |
| Subdivision Type3: | Province |
| Length: | 115km (71miles) |
| Source1 Location: | Cordillera mountains |
| Mouth: | Chico River |
| Mouth Location: | Rizal, Cagayan |
| Mouth Coordinates: | 17.832°N 121.4651°W |
| Progression: | Matalag–Chico–Cagayan |
| Basin Size: | 1330km2 |
The Matalag River is a river in the Philippines flowing from the town of Kabugao in Apayao province to Rizal town in Cagayan province. It is a tributary of the Chico River, which later joins the Cagayan River,[1] the longest river in the country. The Isneg people settled within its area.[2]