Nils-Aslak Valkeapää, known as Áillohaš in the Northern Sami language (23 March 1943 – 26 November 2001), was a Finnish Sami writer, musician and artist. He was born in Enontekiö in Lapland province, Finland. He lived most of his life in Käsivarsi, close to the border of Sweden, and also in Skibotn in Norway. Valkeapää was born to a family of traditional reindeer herders, but was trained as a school teacher. His most well-known international debut was when he performed at the opening ceremony of the 1994 Winter Olympic Games in Lillehammer, Norway. He received the Nordic Council Literature Prize for The Sun, My Father in 1991.

The traditional Sami singing of the joik was important in his music, as well as in his painting and in written works. He was first recognised as an artist for his joik during the 1960s, with his first recording Joikuja from 1968, which contained modernised joik. Valkeapeää wrote the music to the motion picture Ofelaš, internationally known as The Pathfinder in 1987, which was directed by Nils Gaup. As a writer, he mainly wrote in Sami with his work translated into other languages and eventually published eight collections of poems. One of his best known is Beaivi áhčážan which has been translated to English, titled The Sun, My Father.

Nils-Aslak Valkeapää died in his sleep in Espoo on 26 November 2001.