Khyber District (Pashto: خېبر ولسوالۍ, Urdu: ضلع خیبر) is a district in the Peshawar Division of the Khyber Pakhtunkhwa province of Pakistan. Until 2018, it was an agency of the erstwhile Federally Administered Tribal Areas. With the merger of FATA with Khyber Pakhtunkhwa in 2018, it became a district. It ranges from the Tirah valley down to Peshawar. It borders Nangarhar Province to the west, Orakzai District to the south, Kurram District to southwest, Peshawar to the east and Mohmand District to the north.

The major clans in the District Khyber are Shinwari, Afridi, Mulagori and Shalmani. Nevertheless, the majority of the population are Afridis.

All Afridi clans have their own areas in the Tirah Valley, and most of them extend down into the Khyber Pass over which they have always exercised the right of toll. The Malikdin Khel live in the centre of the Tirah and hold Bagh, the traditional meeting place of Afridi jirgas or assemblies. The Aka Khel are scattered in the hills south of Jamrud. All of this area is included in the Khyber Agency. The Adam Khel live in the hills between Peshawar and Kohat. Their preserve is the Kohat Pass in which several of the most important Afridi gun factories are located.

The Afridi Tribe is subclassified into eight sub-tribes listed below.

Khyber District is currently subdivided into these tehsils.

Khyber Pass is a major feature of the Khyber District. Its narrowest point is at Ali Masjid, where the Battle of Ali Masjid occurred. The Khyber Rifles paramilitary organization originated in the area and took their name from it.^{[citation needed]}

A Khyber Pass copy is a homemade firearm characteristic of the Khyber area.

Both the Khyber Mail (passenger train) and the Khyber train safari routes passed through the Khyber District via the Khyber Pass. Khyber Pass Railway is a railway line in Pakistan.