| Official Name: | Sudutuy |
| Native Name: | Судутуй |
| Settlement Type: | Ulus |
| Pushpin Map: | Russia Buryatia#Russia |
| Subdivision Type: | Country |
| Subdivision Name: | Russia |
| Subdivision Name1: | Republic of Buryatia |
| Subdivision Name3: | Bichursky District |
| Subdivision Type4: | Municipality |
| Utc Offset1: | +8:00 |
| Coordinates: | 50.6667°N 132°W[1] |
Sudutuy (Russian: Судутуй) is a rural locality (an ulus) in Bichursky District, Republic of Buryatia, Russia. The population was 38 as of 2010.[2] There is 1 street.
Sudutuy is located 24 km northwest of Bichura (the district's administrative centre) by road. Petropavlovka is the nearest rural locality.[3]