Dera Ismail Khan District (Urdu and Saraiki: ضلع ڈیره اسماعیل خان, Pashto: دېره اسماعيل خان ولسوالۍ), often abbreviated as D.I. Khan is a district in the Dera Ismail Khan division of the Khyber Pakhtunkhwa province of Pakistan. The capital of the district is the town of Dera Ismail Khan. The district has an area of 9,334 km (3,604 sq mi) and a population of 1,822,916 as of the 2023 Census.After the Second Anglo-Sikh war in 1849 the district was annexed bythe British as part of the Punjab and remained so until 1901 when the North West Frontier Province or NWFP (now renamed as Khyber Pakhtunkhwa) was created.