Oum Hadjer
{{Infobox settlement
| official_name = Oum Hadjer
| other_name =
| native_name = أم هاجر
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| pushpin_map = Chad
| pushpin_mapsize = 250
| pushpin_label_position = right
| pushpin_map_caption = Location in Chad (Batha highlighted)
| pushpin_image = Chad 01 region locator map 2008-02.svg
| coordinates = {{coord|13|17|40|N|19|41|29|E|type:city_region:TD|display=inline,title}}
| subdivision_type = Country
| subdivision_name = {{flag|Chad}}
| subdivision_type1 = Region
| subdivision_name1 = Batha
| subdivision_type2 = Department
| subdivision_name2 = Batha Est
| subdivision_type3 = Sub-Prefecture
| subdivision_name3 = Oum Hadjer (أم هاجر)
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| elevation_m = 360
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Oum Hadjer ({{langx|ar|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.{{Cite news|url=https://www.nytimes.com/1982/03/21/world/around-the-world-rebels-said-to-defeat-chad-government-force.html|title=AROUND THE WORLD; Rebels Said to Defeat; Chad Government Force|agency=Reuters|date=1982-03-21|work=The New York Times|access-date=2019-11-21|language=en-US|issn=0362-4331}}[http://nl.newsbank.com/nl-search/we/Archives?p_product=BG&p_theme=bg&p_action=search&p_maxdocs=200&p_topdoc=1&p_text_direct-0=0EADDF1C9FB05143&p_field_direct-0=document_id&p_perpage=10&p_sort=YMD_date:D&s_trackval=GooglePM Boston Globe article on 1990 rebel capture]{{Cite web |url=http://www.romandie.com/infos/news2/080130164504.skxbs1qh.asp |title=Romandie News article on January 2008 fighting |access-date=2008-06-18 |archive-url=https://web.archive.org/web/20160303224303/http://www.romandie.com/infos/news2/080130164504.skxbs1qh.asp |archive-date=2016-03-03 |url-status=dead }}
Oum Hadjer is also the name of the Sub-Prefecture that the city is within. The population of the entire Oum Hadjer Sub-Prefecture is about 14,500.{{Cite web|url=https://www.citypopulation.de/en/chad/|title=Chad: Regions, Cities & Urban Localities - Population Statistics, Maps, Charts, Weather and Web Information|website=www.citypopulation.de|access-date=2019-11-21}}
The town is served by Oum Hadjer Airport.