Nalgonda / Nallagonda District () is a district in Andhra Pradesh. It has a population of 3,247,982 of which 13.32% is urban as of 2001.
Its name is derived from two Telugu words Nalla (Black) & Konda (Hills) i.e. Black Hills. Nalgonda was earlier referred to as Neelagiri, the name given by some Rajput rulers and the name was changed to Nallagonda only after its conquest by Allauddin Bahaman Shah, a Bahamani king.