Deh Piaz (Persian: ده پياز, also Romanized as Deh Pīāz, Deh Peyāz, and Deh Pīyāz) is a village in Hegmataneh Rural District, in the Central District of Hamadan County, Hamadan Province, Iran. At the 2006 census, its population was 4,078, in 902 families.