| Official Name: | Kharyastka |
| Native Name: | Харьястка |
| Settlement Type: | Ulus |
| Pushpin Map: | Russia Buryatia#Russia |
| Subdivision Type: | Country |
| Subdivision Name: | Russia |
| Subdivision Name1: | Republic of Buryatia |
| Subdivision Name3: | Mukhorshibirsky District |
| Subdivision Type4: | Municipality |
| Utc Offset1: | +8:00 |
| Coordinates: | 51.2333°N 146°W[1] |
Kharyastka (Russian: Харьястка; Buriat: Харьяастай) is a rural locality (an ulus) in Mukhorshibirsky District, Republic of Buryatia, Russia. The population was 898 as of 2010.[2] There are 3 streets.
Kharyastka is located 38 km northwest of Mukhorshibir (the district's administrative centre) by road. Khoshun-Uzur is the nearest rural locality.[3]