The Zaječar District (Serbian: Зајечарски округ, romanized: Zaječarski okrug, pronounced [zâjɛtʃarskiː ôkruːɡ]; Romanian: Districtul Zaicear) is one of nine administrative districts of Southern and Eastern Serbia.

Ethnic groups of the district according to the 2011 census results:[2] Felix Romuliana (Galerius' Palace) in modern Gamzigrad is the birthplace of the Roman Emperor Gaius Galerius Valerius Maxmimianus, in late 3rd century and early 4th century.

Because of its archaeological findings, Gamzigrad ranks among the most important late Roman sites in the world.

The rich historic material (jewelry, mosaics, coins, tools, arms) found here is a treasure trove of Roman civilization of the 4th century A.D. Three Roman emperors were born in the Zaječar district: Trends of economic development of the Zaječar District lead from crafts and semi-industrial processing of agricultural products over coal exploitation (textile factory, leather factory, brewery, quartz sand mine and coal mine) to the modern plants and high output rate.

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