Khasa Prakrit (also known as Khas Prakrit, Sanskrit Khasa, Himalayan Prakrit, Northern Prakrit, Khas Kura) is a Prakrit language of medieval South Asia and a common ancestor language of the Pahari languages, which includes Nepali, Kumaoni, Jaunsari, Mandeali, Kangri and Garhwali languages.

[1][2] It was commonly referred to as खश (Khaśa), खष (Khaṣa), and खशीर (khaśīra) in the Sanskrit texts.

Indian linguist Suniti Kumar Chatterji suggests that Nepali language developed from Khasa Prakrit.

[4] Khasa belongs to the Indo-European family of languages.

Like other Indo-Aryan languages, Khasa is a direct descendant of an early form of Vedic Sanskrit, through Shauraseni Prakrit and Śauraseni Apabhraṃśa (from Sanskrit apabhraṃśa "corrupt").