| Official Name: | Sarnaghbyur / Aghbulag |
| Native Name: | Սառնաղբյուր / Ağbulaq |
| Pushpin Map: | Azerbaijan#Karabakh |
| Pushpin Mapsize: | 300 |
| Subdivision Type: | Country |
| Subdivision Type1: | District |
| Subdivision Name1: | Khojaly |
| Population Footnotes: | [1] |
| Population As Of: | 2015 |
| Population Total: | 107 |
| Timezone: | AZT |
| Utc Offset: | +4 |
| Coordinates: | 39.8758°N 46.8969°W |
Sarnaghbyur (Armenian: Սառնաղբյուր) or Aghbulag (Azerbaijani: Ağbulaq) is a village in the Khojaly District of Azerbaijan. Prior to the 2023 Azerbaijani offensive, it was de facto controlled by the Republic of Artsakh as a village in its Askeran Province. The village has an ethnic Armenian-majority population, and also had an Armenian majority in 1989.[2]
During the Soviet period, the village was part of the Askeran District of the Nagorno-Karabakh Autonomous Oblast.
Historical heritage sites in and around the village include an 18th/19th-century cemetery, the cave-shrine of Htsut (Armenian: Հցուտ), and St. George's Church (Armenian: Սուրբ Գևորգ եկեղեցի|Surb Gevorg Yekeghetsi) built in 1875.[1]
The population is mainly engaged in agriculture and animal husbandry. As of 2015, the village has a municipal building, a secondary school, and a medical centre. The community of Sarnaghbyur includes the village of Dahraz.[1]
The village had 97 inhabitants in 2005,[3] and 107 inhabitants in 2015.[1]