Lachin district is an administrative rayon in the Republic of Azerbaijan. Established in 1930. Situated in the Lesser Caucasus, in the south-west of Azerbaijan. Bordered by Armenia on the west. It occupies an area of 1835 km², while the population is 68,900 (as of 01.01.2006). The capital is the city of Lachin.

The rayon includes the city of Lachin, the settlement of Gayghi, the villages of Agbulag (Ağbulaq), Alkhasli (Alxaslı), Ahmadli (Əhmədli), Hajilar (Hacılar), Gulabird (Güləbird), Jagazur (Cağazur), Gushchu (Quşçu), Minkand (Minkənd), Mirik (Mirik), Mihsni (Mişni), Sadinlar (Sadınlar), Sheylanli (Şeylanlı), Agjakand (Ağcakənd), Ardushlu (Arduşlu), Agjayazi (Ağcayazı), Ashagi Farajan (Aşağı Fərəcan), Farajan (Fərəcan), Bozlu (Bozlu), Galaja (Qalaca), Bulunduz (Bülündüz), Ayibazar (Ayıbazar), Birinji Ipak (Birinci İpək), Vagazin (Vaqazin), Bozguney (Bozgüney), Kalafalig (Kalafalıq), Hajikhanli (Hacıxanlı), Govushug (Qovuşuq), Budagdere (Budaqdərə), Hochaz (Hoçaz), Mollalar (Mollalar), Uluduz (Uludüz), Avazlar (Avazlar), Dashli (Daşlı), Velibeyli (Vəlibəyli), Nanshlar (Nanşlar), Hetemler (Hətəmlər), Kaha (Kaha), Jijimli (Cicimli), Ashagi Jijimli (Aşağı Cicimli), Gazidere (Qazıdərə), Zabukh (Zabux), Sus (Sus), Gizilja (Qızılca), Baylik (Bəylik), Irchan (İrçan), Chambarkhach (Çəmbərxaç), Khumarta (Xumarta), Garabeyli (Qarabəyli), Lalebaghirli (Lələbağırlı), Korjabulag (Korcabulaq), Zerti (Zerti), Khirmanlar (Xırmanlar), Birinci Tigik (Birinci Tığik), Ikinji Tigik (İkinci Tığik), Garigishlag (Qarıqışlaq), Soyugbulag (Soyuqbulaq), Gilichli (Qılıçlı), Zeyve (Zeyvə), Kohnekend (Köhnəkənd), Gishlag (Qışlaq), Ayrik (Əyrik), Alijan (Alıcan), Gozlu (Qozlu), Finge (Fingə), Gorchu (Qorçu), Zagaalti (Zağaaltı), Goshasu (Qoşasu), Alpout (Alpout), Bulovluk (Bülövlük), Kurdhaji (Kürdhacı), Arikli (Ərikli), Hajisamli (Hacısamlı), Garasaggal (Qarasaqqal), Kamalli (Kamallı), Chiragli (Çıraqlı), Garakechdi (Qarakeçdi), Katos (Katos), Malkhalaf (Malxələf), Mazutlu (Mazutlu), Malikpaya (Məlikpəyə), Malibey (Malıbəy), Agoglan (Ağoğlan), Husulu (Hüsülü), Ziyrik (Ziyrik), Migidere (Mığıdərə), Deyirmanyani (Dəyirmanyanı), Tarkhanli (Tərxanlı), Dayhan (Dəyhan), Baldirganli (Baldırğanlı), Oguldere (Oğuldərə), Agalarushagi (Ağalaruşağı), Pirjahan (Pircahan), Seyidler (Seyidlər), Aligulu (Əliqulu), Garachanli (Qaraçanlı), Pichenis (Piçənis), Khachinyali (Xaçınyalı), Kohne Jorman (Köhnə Corman), Sonasar (Sonasar), Mayıs (Mayis), Tezekend (Təzəkənd), Hagnazar (Haqnəzər), Ardashavi (Ərdəşəvi), Safiyan (Səfiyan), Khanalilar (Xanalılar), Suarasi (Suarası), Turkler (Türklər), Farrash (Fərraş), Nureddin (Nurəddin), Fetelipeye (Fətəlipəyə), Aganus (Ağanus), Unannovu (Unannovu), Arab (Ərəb), Turshsu (Turşsu), Shelve (Şəlvə), Imanlar (İmanlar), Dambulag (Dambulaq), Shamken (Şamkənd), Alakchi (Ələkçi), Bozdogan (Bozdağan), Jorman (Corman), Naghdali (Nağdalı).

The area is mountainous. Lachin extends to the south-western slope of Karabakh ridge on the east, to the

The area is mountainous. Lachin extends to the south-western slope of Karabakh ridge on the east, to the south-eastern slope of Mikhtokan ridge on the north, to Karabakh plateau on the south-west. The highest point is the Qızılboga mountain (3594 m). Jurassic-anthropogenic sediments are spread. The rayon has mineral resources such as mercury, polymetals, building materials, Narzan-type mineral water springs. Mild warm and cold climate with dry winter prevails over the most of the area. The average temperature is from -10°C to 0°C in January, from 10°C to 22°C in July. Annual precipitation is 600-900 mm. The rayon`s river is Hakari and its tributaries. The most spread soil types are sod mountainous-meadow, brown mountainous-forest and carbonate mountainous-black. The vegetation comprises bushy and rare woods, deciduous mountain forests (oak, hornbeam, beech), sub-alpine and alpine meadows. Animals: mountain goats, deer, wild boars, squirrels, dormice, common voles. Lachin preserve was established.

Lachin is an agricultural region. Cattle-breeding occupies the major place in its economy.

There are 149 secondary schools, 2 pre-school and 5 extracurricular educational institutions, a vocational school, a children  creativity center, 85 clubs, 119 libraries, 5 music schools, and 142 health facilities in the rayon.

The cave-temple (5^th century), mausoleums (14^th-19^th century), a castle (17th century), a mosque (1718), a palace (1716), a bridge (18th century) are registered architectural monuments in the territory of Lachin.

Occupied on May 18, 1992, by the Armenian armed forces.

 Azerbaijan National Encyclopedia. 25 volumes. Volume Azerbaijan, Baku, 2007, p. 866