The Nepalese caste system was the traditional system of social stratification of Nepal. The Nepalese caste system broadly borrows the classical Hindu Chaturvarnashram model, consisting of four broad social classes or varna: Brahmin, Kshatriya, Vaishya, Sudra.

Untouchability is a form of social institution that legitimises and enforces practices that are discriminatory, humiliating, exclusionary and exploitative against people belonging to certain social groups. Although comparable forms of discrimination are found all over the world, untouchability involving the caste system is largely unique to South Asia.