Vayots Dzor (Armenian: Վայոց Ձոր, Armenian pronunciation: [vɑjˌɔt͡sʰ ˈd͡zɔɾ] ) is a province (marz) of Armenia. It lies at the southeastern end of the country, bordering the Nakhchivan exclave of Azerbaijan to the west and the Kalbajar District of Azerbaijan to the east. It covers an area of 2,308 km (891 sq mi). Known for its mountainous terrain, Vayots Dzor is Armenia's most sparsely populated province, with a population was 47,369 in the 2022 census, down from 52,324 at the 2011 census. The capital and largest city of the province is the town of Yeghegnadzor.
A major wine-producing region in Armenia, Vayots Dzor is home to many ancient landmarks and historical attractions. Among them are the Areni-1 cave complex and Areni-1 winery of the Chalcolithic period, the 8th-century Tanahat Monastery, the 10th-century fortress of Smbataberd, and the 13th-century monastery of Noravank. The province is also home to the spa-town of Jermuk and the village of Gladzor, known for the 13th and 14th-century University of Gladzor.