| Mount Unabetsu | |
| Other Name: | 海別岳 |
| Elevation M: | 1419.3 |
| Prominence: | 910 |
| Parent Peak: | Mount Rausu |
| Map: | Japan |
| Label Position: | left |
| Listing: | List of mountains and hills of Japan by height |
| Pronunciation: | pronounced as /ja/ |
| Location: | Hokkaido, Japan |
| Range: | Shiretoko Peninsula |
| Coordinates: | 43.8736°N 144.8656°W |
| Topo: | Geospatial Information Authority 25000:1 海別岳 25000:1 朱円 50000:1 斜里 |
| Type: | Stratovolcano |
| Age: | Quaternary |
| Volcanic Arc/Belt: | Kurile arc |
| Last Eruption: | ca. 0.5 million years ago |
is a Quaternary stratovolcano.[1] Its summit is 1419.3m (4,656.5feet).[2] It is located on Hokkaido's Shiretoko Peninsula on the border of Shari in Shari District, Abashiri and Shibetsu in Shibetsu District, Nemuro.
The mountain is made mainly of andesite and basalt.