Sarnaghbyur (Armenian: Սառնաղբյուր) or Aghbulag (Azerbaijani: Ağbulaq) is a village in the Khojaly District of Azerbaijan, in the region of Nagorno-Karabakh.

[3] 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, romanized: Surb Gevorg Yekeghetsi) built in 1875.

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.