The Central District of Ajab Shir County () is in East Azerbaijan province, Iran. Its capital is the city of Ajab Shir.
At the time of the 2006 National Census, the district's population was 47,017 in 11,835 households. The following census in 2011 counted 49,967 people in 13,548 households. The 2016 census measured the population of the district as 53,845 inhabitants living in 15,540 households.