Sarnaghbyur () or Aghbulag () is a village in the Khojaly District of Azerbaijan, in the region of Nagorno-Karabakh. Until 2023 it was controlled by the breakaway Republic of Artsakh. The village had an ethnic Armenian-majority population until the expulsion of the Armenian population of Nagorno-Karabakh by Azerbaijan following the 2023 Azerbaijani offensive in Nagorno-Karabakh.
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 (), and St. George's Church () built in 1875.
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.
The village had 97 inhabitants in 2005, and 107 inhabitants in 2015.