Lachin (Azerbaijani: Laçın, Armenian: Բերդձոր Berddzor, Kurdish: Laçîn; also Abdallyar, Datschin) is a town in Azerbaijan and the regional center of the Lachin Rayon. Since 1992 the area has been under the control of the de facto independent unrecognized Nagorno-Karabakh Republic, which has renamed the town Berdzor. The town and its surrounding region serve as the strategic Lachin corridor connecting the Nagorno-Karabakh Republic with Armenia. With about 1,700 inhabitants in 2009 (down from 2,300 in 2005), population numbers are still declining despite a proactive settlement policy by the authorities.

Lachin was known as Abdalyar until 1923. On 15 May 1992, during the Nagorno-Karabakh War, Lachin was captured by Nagorno Karabakh forces, opening the first land-corridor to Armenia. Previously, Turkey had threatened Armenia on May 13, 1992, "that it would intervene militarily if Shusha and Lachin were not restored to Azerbaijan". Russia responded by signing a military agreement with Armenia, pledging military aid if its security were threatened. On the May 20, 1992, Turkey reassured Russia, that it would not intervene militarily. Thus, after a three year blockade, a land bridge linking the Republic of Armenia with the territory of Nagorno Karabakh was established. In the fall of 1992, Azerbaijani forces tried to regain control over Lachin, but were repulsed. All of Lachin's Azerbaijani and Kurdish population fled as a result of the fall of the region to Nagorno-Karabakh forces.

Lachin (Azerbaijani: Laçın) is a rayon of Azerbaijan. The capital is the city of Lachin. The region has been controlled by the breakway Nagorno-Karabakh Republic, as part of its Qashatagh Province, since the Nagorno-Karabakh War.

Upon the capture of Lachin rayon, Armenian forces forcefully displaced its entire Azeri and Kurdish population and resettled the region with Armenian refugees from Azerbaijan, settlers from Armenia and ethnic Armenians from other countries apparently with promises of land, livestock and social benefits. The main land-link between Armenia and the Nagorno-Karabakh Republic, known as the Lachin corridor, crosses its territory. The Lachin Kurdish Republic was briefly proclaimed in 1992 during the Nagorno-Karabakh War for Kurdish inhabitants.

In the first half of 2011, 300 Armenian families were settled in Lachin

Between 1923 to 1929, Lachin was established as the Kurdistan Uyezd, an autonomous Soviet district.

Coordinates: 39°38′0″N 46°33′0″E / 39.633333°N 46.55°E / 39.633333; 46.55