The Zaječar District (Serbian: Зајечарски округ, romanized: Zaječarski okrug, pronounced [zâjɛtʃarskiː ôkruːɡ]) is one of administrative districts of Serbia. It lies in the eastern part of the country. According to the 2022 census, it has a population of 96,715 inhabitants. The administrative center of the Zaječar District is the city of Zaječar.