| Official Name: | Arbun |
| Native Name: | Арбун |
| Settlement Type: | Ulus |
| Pushpin Map: | Russia Buryatia#Russia |
| Subdivision Type: | Country |
| Subdivision Name: | Russia |
| Subdivision Name1: | Republic of Buryatia |
| Subdivision Name3: | Kurumkansky District |
| Subdivision Type4: | Municipality |
| Utc Offset1: | +8:00 |
| Coordinates: | 54.1833°N 126°W[1] |
Arbun (Russian: Арбун) is a rural locality (an ulus) in Kurumkansky District, Republic of Buryatia, Russia. The population was 8 as of 2010.[2]
Arbun is located 51 km east of Kurumkan (the district's administrative centre) by road. Amatkhan is the nearest rural locality.[3]