The caste system in India is the paradigmatic ethnographic instance of social classification based on castes.

Muslim communities in South Asia have a system of social stratification arising from concepts other than "pure" and "impure", which are integral to the caste system in India.

The Nepalese caste system is the traditional system of social stratification of Nepal.

The caste system in Kerala differed from that found in the rest of India.

The caste systems in Sri Lanka are social stratification systems found among the ethnic groups of the island since ancient times.

the system by which Newārs, the historical inhabitants of Kathmandu Valley, are divided into groups on the basis of Vedic varna model and divided according to their hereditary occupations.

The caste system in Goa consists of various Jātis or sub-castes found among Hindus belonging to the four varnas (Brahmin, Kshatriya, Vaishya, and Shudra), as well as those outside of them.

a traditional practice in Igboland, characterized by social segregation and restrictions on interaction and marriage with a group of individuals known as Osu (Igbo: outcast).