Adrar (Arabic: ولاية أدرار, Berber languages: ⴰⴷⵔⴰⵔ) is a province (wilaya) in southwestern Algeria, named after its capital Adrar.

It is the second-largest province, with an area of 424,948 km2, roughly the size of the US state of California.

[1] It is bordered by six other wilayas: to the west by Tindouf, to the northwest by Béni Abbès, to the north by Timimoun, to the east by In Salah, to the southeast by Tamanrasset, To the south by Bordj Badji Mokhtar, and to the southwest by Mauritania.

Adrar is composed of three natural and cultural regions: Touat (Adrar, Zaouiet Kounta), Gourara (Aougrout, Timimoune) and Tidikelt (Aoulef), and 299 ksour.

The province of Adrar is located in south-west Algeria.