| Official Name: | Tsaydam |
| Native Name: | Цайдам |
| Settlement Type: | Ulus |
| Pushpin Map: | Russia Buryatia#Russia |
| Subdivision Type: | Country |
| Subdivision Name: | Russia |
| Subdivision Name1: | Republic of Buryatia |
| Subdivision Name3: | Selenginsky District |
| Subdivision Type4: | Municipality |
| Utc Offset1: | +8:00 |
| Coordinates: | 51.1°N 127°W[1] |
Tsaydam (Russian: Цайдам; Buriat: Сайдам, Saidam) is a rural locality (an ulus) in Selenginsky District, Republic of Buryatia, Russia. The population was 206 as of 2010.[2] There are 5 streets.
Tsaydam is located 36 km southwest of Gusinoozyorsk (the district's administrative centre) by road. Gusinoye Ozero is the nearest rural locality.[3]