| Official Name: | Istok |
| Native Name: | Исток |
| Settlement Type: | Selo |
| Pushpin Map: | Russia Buryatia#Russia |
| Subdivision Type: | Country |
| Subdivision Name: | Russia |
| Subdivision Name1: | Republic of Buryatia |
| Subdivision Name3: | Kabansky District |
| Subdivision Type4: | Municipality |
| Utc Offset1: | +8:00 |
| Coordinates: | 52.0833°N 121°W[1] |
Istok (Russian: Исток) is a rural locality (a selo) in Kabansky District, Republic of Buryatia, Russia. The population was 262 as of 2010.[2] There are 6 streets.
Istok is located 39 km northwest of Kabansk (the district's administrative centre) by road. Istomino is the nearest rural locality.[3]