Adjara (Georgian: აჭარა [at͡ʃʼara]), officially known as the Autonomous Republic of Adjara (აჭარის ავტონომიური რესპუბლიკა [at͡ʃʼaris avtʼɔnɔmiuri rɛspʼublikʼa]), is a historical, geographic and political-administrative region of Georgia. Located in the country's southwestern corner, Adjara lies on the coast of the Black Sea near the foot of the Lesser Caucasus Mountains, north of Turkey. It is an important tourism destination and includes Georgia's second-largest city of Batumi as its capital. About 350,000 people live on its 2,880 km².

Adjara is home to the Adjarians, a regional subgroup of Georgians. Adjara's name can be spelled in a number of ways, including Ajara, Ajaria, Adjaria, Adzharia, and Achara, among others. Under the Soviet Union, Adjara was part of the Georgian Soviet Socialist Republic as the Adjarian ASSR.

Adjara has been part of Colchis and Caucasian Iberia since ancient times. Colonized by Greeks in the 5th century BC, the region fell under Rome in the 2nd century BC. It became part of the region of Egrisi before being incorporated into the unified Georgian Kingdom in the 9th century AD.

The Ottomans conquered the area in 1614. The people of Adjara converted to Islam in this period. The Ottomans were forced to cede Adjara to the expanding Russian Empire in 1878.

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