| Official Name: | Sagasi-Deybuk |
| Native Name: | Сагаси-Дейбук |
| 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: | Kayakentsky District |
| Subdivision Type4: | Municipality |
| Utc Offset1: | +3:00 |
| Coordinates: | 42.5°N 97°W[1] |
Sagasi-Deybuk (Russian: links=no|Сагаси-Дейбук) is a rural locality (a selo) and the administrative centre of Sagasi-Deybuksky Selsoviet, Kayakentsky District, Republic of Dagestan, Russia. The population was 1,986 as of 2010.[2] There are 24 streets.[3]
Sagasi-Deybuk is located 29 km northwest of Novokayakent (the district's administrative centre) by road. Karanayaul and Pervomayskoye are the nearest rural localities.[4]
Dagins and Kumyks live there.