| Abulog River | |
| Pushpin Map: | Luzon mainland#Philippines |
| Pushpin Map Caption: | Abulog River mouth |
| Subdivision Type1: | Country |
| Subdivision Name1: |  Philippines |
| Subdivision Type2: | Region |
| Subdivision Type3: | Province |
| Length: | 196km (122miles) |
| Depth Min: | 200m3/s |
| Discharge1 Location: | Babuyan Channel |
| Source1 Location: | Apayao |
| Mouth Elevation: | 0m (00feet) |
| Basin Size: | 3372km2 |
The Abulog River or Abulug River is the 9th largest river system in the Philippines in terms of watershed size.[1] [2] It has an estimated drainage area of and a length of from its source in the mountains of Apayao in the Cordillera Administrative Region. More than 90% of the drainage area of the river is located in Apayao province while the remaining, including the mouth of the river, is in Cagayan province.
The upper reaches of the Abulug River, especially upstream from Kabugao, is commonly known as the Apayao River.