Religion in Nepal in the context of "History of Nepal"

Hinduism is the largest religion in South Asia with about 1.2 billion Hindus, forming just under two-thirds of South Asia's population. South Asia has the largest population of Hindus in the world, with about 99% of all global Hindus being from South Asia. Hinduism is the dominant religion in India and Nepal and is the second-largest religion in Bangladesh, Pakistan, Sri Lanka, and Bhutan.

Indo-Aryan migrations brought the Indo-Aryans to South Asia, where they compiled and composed the Vedic corpus during the Vedic period (ca. 1500-500 BCE) across present-day Northern India, Pakistan and Afghanistan. The subsequent period, between 800 BCE and 250 BCE, was "a turning point between the Vedic religion and Hindu religions", and a formative period for Hinduism, Jainism and Buddhism. The Epic and Early Puranic period, from c. 250 BCE and 500 CE, saw the onset of the Hindu synthesis, followed by the classical "Golden Age" of India (c. 350 - 650 CE), which coincides with the Gupta Empire.

Hinduism is the largest religion in Nepal. In 2006, the country declared itself a secular country through democracy, after the abolition of its monarchy. According to the 2021 census, the Hindu population in Nepal is estimated to be around 23,677,744 which accounts for at least 81.19% of the country's population, the highest percentage of Hindus of any country in the world. Vikram Samvat, one of the two official calendars used in Nepal, is a solar calendar essentially the same to that widespread in North India as a religious calendar, and is based on Solar unit of time.

Among the ethnic groups are the Bahun, Thakuri, Tharu, Chhetri, Magars, Hill Dalits, Madheshi, Newari people. Meanwhile, among the major ethnic groups Sherpa, Rai, Limbu, Gurung and Tamang have lowest percentage of followers of Hinduism within the group.