Aq Qabaq-e Sofla (Persian: اق قباق سفلي) is a village in, and the capital of, Aslan Duz-e Sharqi Rural District of the Central District of Aslan Duz County, Ardabil province, Iran.

At the 2006 census, its population was 972 in 159 households, when it was in Aslan Duz Rural District of Aslan Duz District, Parsabad County. The following census in 2011 counted 866 people in 216 households. The latest census in 2016 showed a population of 978 people in 284 households. It was the most populous village in its rural district.

In 2017, the district was separated from the 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.