The Deilami language (Deilami: ديلمي), also known as Daylamite, Daylami, Dailamite, or Deylami, is an extinct language which is a member of the northwestern Iranian language branch, of Iranian Languages. It was spoken in northern Iran, specifically in the mountainous area in Gīlān, Mazandaran, and Ghazvin Provinces.Parviz Natel Khanlari listed this language as one of Iranian dialects spoken between the 9th and 13th centuries.