Zeyn ol Din (, also Romanized as Zeyn ol Dën, Zeyn Ed Dën, and Zeyn od Dën; also known as Amër Zeyn od Dën and Shahrak-e Zeyn od Dën) is a village in Aspas Rural District, Sedeh District, Eqlid County, Fars province, Iran. At the 2006 census, its population was 91, in 16 families.