| Official Name: | Yamansu |
| Native Name: | Ямансу Лакха-Отар |
| Settlement Type: | Selo |
| Pushpin Map: | Russia Dagestan#Russia |
| Subdivision Type: | Country |
| Subdivision Name: | Russia |
| Subdivision Type1: | Region |
| Subdivision Name1: | Republic of Dagestan |
| Subdivision Type2: | County |
| Subdivision Type3: | District |
| Subdivision Name3: | Novolaksky District |
| Subdivision Type4: | Municipality |
| Utc Offset1: | +3:00 |
| Coordinates: | 43.1333°N 71°W[1] |
Yamansu (Russian: Ямансу; Chechen: Лакха-Отар, Laqa-Otar) is a rural locality (a selo) in Novolaksky District, Republic of Dagestan, Russia. The population was 781 as of 2010.[2] There are 15 streets.[3]
Yamansu is located 21 km southwest of Khasavyurt[4] and 7 km northwest of Novolakskoye (the district's administrative centre) by road, on the Yamansu River. Banayurt and Balansu are the nearest rural localities.[5]
Chechens live there.