Kỳ Sán is a rural district in western Nghá» An Province in the North Central Coast region of Vietnam. As of 2003 the district had a population of 63,198. The district covers an area of . The district capital lies at Mðá»Âng Xén.
Kỳ Sán borders Xam Neua in the north, Nong Het and Mok May in the west, Khamkeut and Viengthong in the south, and Tðáng Dðáng in the east.
In the past, Kỳ Sán was best known for opium poppy growing.