Syunik (Armenian: Սյունիք, Armenian pronunciation: [sjuˈnikʰ], is the southernmost province of Armenia. It is bordered by the Vayots Dzor Province from the north, Azerbaijan’s Nakhchivan Autonomous Republic exclave from the west, the de facto independent Nagorno-Karabakh Republic from the east, and Iran from the south. Its capital and largest city is the town of Kapan. The National Statistical Service of the Republic of Armenia (ARMSTAT) reported its population was 141,771 in the 2011 census, down from 152,684 at the 2001 census.

Syunik is located between the Nakhchivan Autonomous Republic of Azerbaijanfrom the west, and the de facto independent Nagorno-Karabakh Republic from the east. The Vayots Dzor Province of Armenia forms its northern borders, while Aras River at the south separates Syunik from Iran. Syunik covers an area of 4,506 km² (15% of total area of Armenia), making it the second-largest province in Armenia after Gegharkunik in terms of the total area.

Historically, the current territory of the province occupies most of the historic Syunik province of Ancient Armenia.

Syunik is a mountainous region, mainly covered with thick green forests. The Zangezur Mountains occupy most of the territories of Syunik. Mount Kaputjugh with a height of 3905 meters and Mount Gazanasar with a height of 3829 meters are the highest peaks of the province.

Many of the forests in Syunik are protected by the government, including the Arevik National Park, the Shikahogh State Reserve, the Boghakar Sanctuary, the Goris Sanctuary, the Plane Grove Sanctuary, the Sev Lake Sanctuary, and the Zangezur Sanctuary,

Major water basins include the rivers of Vorotan, Voghji, Sisian, Meghri and Vachagan.

Summer temperature can reach up to 40 °C, although the average temperature is around 22 °C, while in winter it may reach down to -12.5 °C. Its border with Nakhchivan to the west is defined by the Zangezur Mountains.