The Katir (also spelled Kati, Kator and Kata) are a Nuristani tribe in Afghanistan and Pakistan.

The Katir [ka 'tɘ] or Kata Kafir group was numerically the most dominant group of the Siah-Posh (Persian "Black Wearer/Clothed") tribes. They owned approximately forty villages in the Bashgul valley and numbered about 40,000 (1890).

The upper part of the Bashgul Valley of Nuristan (Afghanistan) is known as Katirgul. It is called Lutdeh in Chitrali and Kantozi in Pashto.

According to George Scott Robertson, the Katir Siah-Posh clan settled in Katirgul valley was called Kamtoz (or Camtoz) in Pashto and Lutdehhchis in Chitrali (The Kafirs of the Hindu Kush, p 71). But American investigator Richard Strand's website suggests that the name Kamtoz/Kamtozi may apply to all Katirs of the former Siah-Posh group, including the Ramguli and Kulam Katirs [1].

Alternative names for Kamtoz are Camtozi, Kantozi. Despite their fiercely independent nature, the Katis, together with the Kom tribe, were tributary to the Mehtar of Chitral. The nature of this tributary relationship was inconsistent because the Katis and Koms would often raid Chitrali territory for livestock and head-hunting. In retaliation the Mehtars would invade the Bashgul Valley and enslave entire villages. During the reign of Mehtar Aman-ul-Mulk the relationship was formalized and the Kafirs would pay an annual tribute of slaves.

Numerous scholars have connected the names Katir/Kator/Kata and Kam/Kom with ancient Kambojas and identified the Kafirs, especially the Siah-Posh Kafirs, as having descended from ancient. The Kata Tribe also lives in Chitral and very much mixed with Chitralis. There is a popular stone by the name of Kata Boht situated in Ozhore (Juwara) Valley Chitral. The Kata Tribe also lives in Ozhore and also other part of Chitral. The other fact is the tribe lives in Gram; gram is a Nuristani word (of Indo-Aryan origin) meaning "village" (as a "community"). In ancient times, people were considered rich according to their ownership of animals or land. As the Kata tribe in Chitral was considered to be relatively rich, over time, Chitrali speakers began to use kata to mean "rich" or "big".

Kafiristan is a mountainous region of the Hindu Kush that was isolated and politically independent until the conquest by Afghan conquest of 1896. The region became a refuge of an old group of Indo-European people probably mixed with an older substratum, as well as a refuge of a distinct Kafiri group of Indo-Iranian languages, forming part of the wider Dardic languages. The inhabitants were known as "kafirs" due to their enduring polytheism (closely related to Vedic religion) while other regions around them became Muslim. However, the influence from district names in Kafiristan of Katwar or Kator and the ethnic name Kati has also been suggested. The Kafirs were divided into Siyah-Posh, comprising five sub-tribes who spoke Katɘ language while the others were called Safed-Posh comprising Paruni, Waigeli, Wamai and Ashkun.

The Nuristani/Kafir people practiced a form of ancient Hinduism, infused with accretions developed locally. Kafirs represent non-Rigvedic Aryans, identical with the Dasas. That their ancestors were pre-Rigvedic Aryans can be inferred from linguistic, ethnological and theological evidence. The Kafiri/Nuristani languages contain certain phonetic features not found in Indo-Iranian languages. Their chief deity is Imra i.e. Yamaraja which was brought there by the Dasas who worshipped Asuras especially Yama and Varuna. Their primary goddess was Disani. They also worshipped Indra or Inder.