Gegharkunik (Armenian: , Armenian pronunciation: [ɡɛʁɑɾkʰuˈnikʰ]), is a province (marz) of Armenia. Its capital and largest city is the town of Gavar.

Gegharkunik Province is located at the eastern part of Armenia, bordering Azerbaijan and the Shahumyan Region of Nagorno-Karabakh Republic. With an area of 5,348 km², Gegharkunik is the largest province in Armenia. However, approximately 1,278 km² of its territory is covered by Lake Sevan, the largest lake in the Caucasus and a major tourist attraction of the region.

The village of Artsvashen province has an exclave inside Azerbaijan is also a part of the province. However, it was attacked and forcefully occupied by Azerbaijan during the Nagorno-Karabakh War.

The Yerevan-Sevan-Dilijan republican highway runs through the province.

The name of Gegharkunik is derived from Gegham, a 5th-generation Haykazuni King and one of the descendants of the legendary patriarch and founder of the Armenian nation Hayk. Gegham was the father of Sisak (founder of the Siunia dynasty), and Harma (grandfather of Ara the Beautiful). Gegham mountains and the Lake of Gegham (currently known as Lake Sevan) were also named after Gegham.

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