The District derived its name as Nizamabad (Nizam-a-abadi) from the Nizam of Hyderabad Asaf jahi,VI who had ruled Deccan during the 18th century A.D. Originally the District was called Indur known to have originated in the name of king Indradatta who had ruled this region during the 5th century A.D.
The history of Nizamabad is discontinues with gaps which are yet to be bridged. The district has a few pre-historic sites. The existence of fairly developed megalithic culture was discovered at the erstwhile taluks of Armoor, Yellareddy and Kamareddy.