| Bonasila River | |
| Name Etymology: | Down below creek |
| Map Size: | 300 |
| Pushpin Map: | USA Alaska |
| Pushpin Map Size: | 300 |
| Pushpin Map Caption: | Location of the mouth of the Bonasila River in Alaska |
| Subdivision Type1: | Country |
| Subdivision Name1: | United States |
| Subdivision Type2: | State |
| Subdivision Name2: | Alaska |
| Subdivision Type4: | Census Area |
| Subdivision Name4: | Yukon - Koyukuk |
| Length: | 125miles[1] |
| Source1: | Nulato Hills |
| Source1 Coordinates: | 62.9406°N -161.205°W |
| Source1 Elevation: | 1783feet[2] |
| Mouth: | Yukon River |
| Mouth Location: | Bonasila Slough near Elkhorn Island, 27miles northwest of Holy Cross |
| Mouth Coordinates: | 62.5328°N -160.2094°W[3] |
| Mouth Elevation: | 26feet |
The Bonasila River (Deg Xinag: Ngidegh Srixno') is a 125miles tributary of the Yukon River in the U.S. state of Alaska.[1] It heads in the Nulato Hills and flows generally southeast to the Bonasila Slough, an anabranch of the larger river.[1] The slough flows around the west side of Elkhorn Island, which is about 27miles northwest of Holy Cross, further downstream on the Yukon.[1]