Vilkij District () is in Namin County, Ardabil province, Iran. Its capital is the city of Abi Beyglu.
At the time of the 2006 National Census, the district's population was 23,940 in 4,930 households. The following census in 2011 counted 24,960 people in 6,583 households. The 2016 census measured the population of the district as 25,945 inhabitants living in 7,031 households.