| Official Name: | Arzgun |
| Native Name: | Арзгун |
| 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: | 54.3667°N 154°W[1] |
Arzgun (Russian: Арзгун) is a rural locality (an ulus) in Kurumkansky District, Republic of Buryatia, Russia. The population was 796 as of 2010.[2] There are 16 streets.
Arzgun is located 51 km east of Kurumkan (the district's administrative centre) by road. Zaimka Amatkhan is the nearest rural locality.[3]