Idir-e Sofla () is a village in Aslan Duz-e Gharbi Rural District of the Central District in Aslan Duz County, Ardabil province, Iran. The village is populated by the Kurdish Chalabianlu tribe.
At the time of the 2006 National Census, the village's population was 61 in 11 households, when it was in Aslan Duz Rural District of the former Aslan Duz District in Parsabad County. The following census in 2011 counted 50 people in 13 households. The 2016 census measured the population of the village as 40 people in 11 households.
In 2019, the district was separated from the county in the establishment of Aslan Duz County. The rural district was transferred to the new Central District and renamed Aslan Duz-e Gharbi Rural District.