India offers astounding variety in virtually every aspect of social life. Diversities of ethnic, linguistic, regional, economic, religious, class, and caste groups crosscut Indian society, which is also permeated with immense urban-rural differences and gender distinctions. Differences between north India and south India are particularly significant, especially in systems of kinship and marriage. Indian society is multifaceted to an extent perhaps unknown in any other of the world’s great civilizations—it is more like an area as varied as Europe than any other single nation-state. Adding further variety to contemporary Indian culture are rapidly occurring changes affecting various regions and socioeconomic groups in disparate ways. Yet, amid the complexities of Indian life, widely accepted cultural themes enhance social harmony and order.

Traditional Indian society is sometimes defined by social hierarchy. The Indian caste system embodies much of the social stratification and many of the social restrictions found in the Indian subcontinent. Social classes are defined by thousands of endogamous hereditary groups, often termed as jātis, or "castes". India declared untouchability to be illegal in 1947 and has since enacted other anti-discriminatory laws and social welfare initiatives.

Family values are important in the Indian tradition, and multi-generational patriarchal joint families have been the norm in India, though nuclear families are becoming common in urban areas. An overwhelming majority of Indians, with their consent, have their marriages arranged by their parents or other family elders. Marriage is thought to be for life, and the divorce rate is extremely low, with less than one in a thousand marriages ending in divorce. According to an Indian government study, an additional 21 million girls are unwanted and do not receive adequate care. Despite a government ban on sex-selective foeticide, the practice remains commonplace in India (esp. rural), the result of a preference for boys in a patriarchal society.

Many Indian festivals are religious in origin. The best known include: Diwali, Ganesh Chaturthi, Thai Pongal, Holi, Durga Puja, Eid ul-Fitr, Bakr-Id, Christmas, and Vaisakhi.