| Aslan Duz County | |
| Native Name: | Persian: شهرستان اصلاندوز |
| Settlement Type: | County |
| Image Map1: | IranArdabil-SVG.svg |
| Map Caption1: | Location of Ardabil province in Iran |
| Subdivision Type: | Country |
| Subdivision Type1: | Province |
| Subdivision Name1: | Ardabil |
| Seat Type: | Capital |
| Seat: | Aslan Duz |
| Parts Type: | Districts |
| Parts Style: | para |
| P1: | Central |
| P2: | Borran |
| Area Total Km2: | 592 |
| Population Density Km2: | auto |
| Coordinates: | 39.3908°N 47.5411°W |
| Coordinates Footnotes: | [1] |
| Timezone: | IRST |
| Utc Offset: | +3:30 |
Aslan Duz County (Persian: شهرستان اصلاندوز) is in Ardabil province, Iran. Its capital is the city of Aslan Duz,[2] whose population at the time of the 2016 National Census was 6,348 people in 1,760 households.[3]
In 2017, Aslan Duz District was separated from Parsabad County in the establishment of Aslan Duz County, which was divided into two districts of two rural districts each, with Aslan Duz as its capital and only city at the time.[2] The village of Borran-e Olya was elevated to the status of a city in 2023.[4]
Aslan Duz County's administrative structure is shown in the following table.
| Administrative Divisions | |
|---|---|
| Central District | |
| Aslan Duz-e Gharbi RD | |
| Aslan Duz-e Sharqi RD | |
| Aslan Duz (city) | |
| Borran District | |
| Borran RD | |
| Qeshlaq-e Gharbi RD | |
| Borran-e Olya (city) | |