Nimbolouk District (Persian: بخش نیمبلوک) is a district (bakhsh) in Qaen County, South Khorasan Province, Iran. Its seat is Khezri dasht Bayaz At the 2016 census, its population was 20,870, in 5,400 families. The District has two cities: and . The District has two rural districts (dehestan): and .