Hindko (ہندکو, romanized: Hindko, IPA: [ˈɦɪndkoː]) is a cover term for a diverse group of Lahnda dialects spoken by several million people of various ethnic backgrounds in several areas in northwestern Pakistan, primarily in the province of Khyber Pakhtunkhwa and northwestern regions of Punjab.

The name "Hindko" means "the Indian language" or "language of Hind", and refers to the Indo-Aryan speech forms spoken in the northern Indian subcontinent, in contrast to the neighbouring Pashto, an Iranic language spoken by the Pashtun people. An alternative local name for this language group is Hindki. A speaker of Hindko may be referred to as Hindki, Hindkun, or Hindkowan (Hindkuwan).

Like other Lahnda varieties, Hindko is derived from the Shauraseni Prakrit. Hindko to some extent is mutually intelligible with Punjabi and Saraiki, and has more affinities with the latter than with the former.

There is a nascent language movement, and in recent decades Hindko-speaking intellectuals have started promoting the view of Hindko as a separate language. There is a literary tradition based on Peshawari, the urban variety of Peshawar in the northwest, and another one based on the language of Abbottabad in the northeast. In the 2023 census of Pakistan, 5.6 million people declared their language to be Hindko, while a 2020 estimate placed the number of speakers at 7 million.

Varieties of Hindko are primarily spoken in a core area in the district of Attock in the northwestern corner of the province of Punjab, and in two neighbouring regions: in Peshawar to the north-west, and Hazara to the north-east, both in the province of Khyber Pakhtunkhwa (formerly known as the North-West Frontier Province). The Hindko of Hazara also extends east into nearby regions of Azad Kashmir.

The central dialect group comprises Kohati (spoken in the city of Kohat and a few neighbouring villages in Khyber Pakhtunkhwa) and the three closely related dialects of Attock District, Punjab: Chacchi (spoken in Attock and Haripur Tehsils), Ghebi (spoken to the south in Pindi Gheb Tehsil) and Awankari (spoken in Talagang Tehsil, now part of Chakwal District). Rensch's classification based on lexical similarity also assigns to this group the rural dialects of Peshawar District. Shackle, however, sees most of them as closely related to the urban variety of Peshawar City.

In a group of its own is Peshawari, the prestigious urban variety spoken in the city of Peshawar and the one that is promoted as a standardised literary language. It has a wide dialectal base and has undergone the influence of Urdu and Standard Punjabi.

A separate group is formed in the northeast by the relatively homogeneous dialects of the Hazara region, which are collectively known as Hazara Hindko or Northern Hindko, with the variety spoken in Kaghan Valley known as Kaghani, and the variety of Tanawal known variously as Tanoli Hindko, Tanoli or Tinauli. Hindko is also spoken further east into Kashmir. It is the predominant language of the Neelum Valley, in the north of Pakistan-administered Azad Kashmir, where it is locally known as Parmi (or Pārim; the name likely originated in the Kashmiri word apārim 'from the other side', which was the term used by the Kashmiris of the Vale of Kashmir to refer to the highlanders, who spoke this language). This variety is also spoken across the Line of Control into Indian-administered Jammu and Kashmir.