Oum Hadjer (Arabic: أم هاجر) is a small city in Chad, and the capital of Batha Est Department.

It straddles the ephemeral Batha River, lies on the main road between Khartoum and N'Djamena, and has a small airport.

Strategically located, it has been contested by government and rebel forces in 1982, 1990, and January 2008.

The population of the entire Oum Hadjer Sub-Prefecture is about 14,500.

[4] The town is served by Oum Hadjer Airport.