Saint Sarkis Monastery of Gag (Armenian: Գագա Սուրբ Սարգիս Վանք, Gaga Surp Sarkis Vank) is a ruined, medieval Armenian Apostolic monastery in the Qazakh Rayon of the Republic of Azerbaijan. It is located about 500 metres to the east of the present-day border of Armenia, and four kilometres west of the village of Dash Salakhly.