Hindi

Hindustani is the lingua franca of northern India and Pakistan, and through its two standardized registers, Hindi and Urdu, an official language of India and Pakistan.

Khariboli, also known as Khari Boli or simply Khari, Dehlavi, Kauravi, and Vernacular Hindustani, is the prestige dialect of Hindustani, of which Standard Hindi and Standard Urdu are standard registers and literary styles, which are the principal official languages of India and Pakistan respectively.

Awadhi (Devanagari: अवधी) is an Indo-Aryan language spoken primarily in the Awadh region of Uttar Pradesh and Terai belt of Nepal.

Braj Bhāshā (Devanagari: ब्रज भाषा; Gurmukhi: ਬ੍ਰਜ ਭਾਸ਼ਾ), also called Brij Bhāshā (बृज भाषा, ਬ੍ਰਿਜ ਭਾਸ਼ਾਾ), Braj Bhākhā (ब्रज भाखा, ਬ੍ਰਜ ਭਾਖ), or Dehaatī Zabaan (देहाती ज़बान, ਦੇਹਾਤੀ ਜ਼ਬਾਨ, 'country tongue'), is a Western Hindi language closely related to Hindustani.

Chhattisgarhi (Devanagari: छत्तीसगढ़ी) is a language spoken in the Indian state of Chhattisgarh, by 17.

Bundeli (Devanagari: बुन्देली or बुंदेली; Nastaliq: زبان بندیلی), or Bundelkhandi, is an Indo-Aryan language spoken in the Bundelkhand region of central India.

Bagheli (Devanagari: बघेली or बाघेली), or Baghelkhandi, is an Indo-Aryan language spoken in the Baghelkhand region of central India.

The Hindi Belt or Hindi Heartland is a loosely defined linguistic region in north-central India where varieties of Hindi in the broadest sense are widely spoken.

The Central Zone or Madhya are the central varieties of the Hindi Belt of the Indo-Aryan languages.

The Anti-Hindi agitation of 1937–40 is a series of protests that happened in Madras Presidency of the British Raj during 1937-40.

The Anti-Hindi imposition agitations of Tamil Nadu were a series of agitations that happened in the Indian state of Tamil Nadu (formerly Madras State and part of Madras Presidency) during both pre- and post-Independence periods.

The Hindi–Urdu controversy is an ongoing dispute—dating back to the 19th century—regarding the status of Hindi and Urdu as a single language, Hindustani, or as two dialects of a single language, and the establishment of a single standard language in certain areas of north and northwestern India.