Agsu (Ağsu) is a raion in central Azerbaijan.

According to some sources that Agsu city was founded by Nadir Shah, in 1735. The remainders of that city (“Ruined city”) is situated in the south of Agsu city. The name of the city is derived from “Agsuchay” which flow through the city. City status was given to Agsu, in 1967. Agsu district was arranged, in 1943. it is bounded by Ismayilli from the north and north-west, Shamakhi from the north-west and east, Kurdamir and Hadzhigabul from the south.

Its territory is 1020 km2, population in 69.4 persons. There are a city (Agsu city), 78 villages. These dwelling areas are embraced by 24 territorial representations and 60 municipalities. Gagali, Kendoba, Calva, Pirhassanli, Bidzho, Dzhalayir, Padar, Arabushagi and Garagoyunlu are the greatest villages of the district.

49.1% of the population is male, 50.9% is female. 99% of the population is Azerbaijani, 1% is lezghin, Turkish and other. 25.7% of the population lives in the city, 74.3% lives in villages. 2068 refugees and forced immigrants were settled down in the district. They are moved here from Armenia, Uzbekistan and our occupied regions.