History of Hinduism denotes a wide variety of related religious traditions native to the Indian subcontinent notably in modern-day Nepal and India.[1] Its history overlaps or coincides with the development of religion in Indian subcontinent since the Iron Age, with some of its traditions tracing back to prehistoric religions such as those of the Bronze Age Indus Valley Civilization. It has thus been called the "oldest religion" in the world.[note 1] Scholars regard Hinduism as a synthesis[11][12][13] of various Indian cultures and traditions,[12][14][11] with diverse roots[15] and no single founder.[16][note 2]

The history of Hinduism is often divided into periods of development, with the first period being that of the historical Vedic religion dated from about 1900 BCE to 1400 BCE.[22][note 3] The subsequent period, between 800 BCE and 200 BCE, is "a turning point between the Vedic religion and Hindu religions",[25] and a formative period for Hinduism, Jainism and Buddhism. The Epic and Early Puranic period, from c. 200 BCE to 500 CE, saw the classical "Golden Age" of Hinduism (c. 320-650 CE), which coincides with the Gupta Empire. In this period the six branches of Hindu philosophy evolved, namely Samkhya, Yoga, Nyaya, Vaisheshika, Mīmāṃsā, and Vedanta. Monotheistic sects like Shaivism and Vaishnavism developed during this same period through the Bhakti movement. The period from roughly 650 to 1100 CE forms the late Classical period[26] or early Middle Ages, in which classical Puranic Hinduism is established, and Adi Shankara's Advaita Vedanta, which incorporated Buddhist thought into Vedanta, marking a shift from realistic to idealistic thought.

Hinduism under both Hindu and Islamic rulers from c. 1200 to 1750 CE,[27][28] saw the increasing prominence of the Bhakti movement, which remains influential today. The colonial period saw the emergence of various Hindu reform movements partly inspired by western movements, such as Unitarianism and Theosophy. The Partition of India in 1947 was along religious lines, with the Republic of India emerging with a Hindu majority. During the 20th century, due to the Indian diaspora, Hindu minorities have formed in all continents, with the largest communities in absolute numbers in the United States and the United Kingdom. In the Republic of India, Hindu nationalism has emerged as a strong political force since the 1980s, the Bharatiya Janata Party forming the Government of India from 1999 to 2004, and its first state government in South India in 2006, and also the Narendra Modi led Government from 2014.