Buin Miandasht County () is a county in Isfahan province, Iran. Its capital is the city of Buin Miandasht.
In 2013, Buin Miandasht District was separated from Faridan County in the establishment of Buin Miandasht County, which was divided into two districts and five rural districts, with Buin Miandasht as its capital.
At the time of the 2016 National Census, the county's population was 24,163 in 8,026 households.
Buuin Miandasht County's population and administrative structure are shown in the following table.