Hindu mythology refers to the collection of myths associated with Hinduism, derived from various Hindu texts and traditions. These myths are found in sacred texts such as the Vedas, the Itihasas (the Mahabharata and the Ramayana), and the Puranas. They also appear in regional and ethnolinguistic texts, including the Bengali Mangal Kavya and the Tamil Periya Puranam and Divya Prabandham. Additionally, Hindu myths are also found in widely translated fables like the Panchatantra and the Hitopadesha, as well as in Southeast Asian texts influenced by Hindu traditions.

Myth is a genre of folklore or theology consisting primarily of narratives that play a fundamental role in a society, such as foundational tales or origin myths. For folklorists, historians, philosophers or theologians this is very different from the use of "myth" simply indicating that something is not true. Instead, the truth value of a myth is not a defining criterion. Hindus see this as not just tales, but their history and tradition passed on in literary form.

Hindu myths can be found in the Vedas, the itihasa (Ramayana and Mahabharata), and the major Puranas. Other sources include the Bengali literature, such as Mangal-Kāvya, and the Tamil literature, such as Divya Prabandham, Tirumurai and the Five Great Epics. These narratives play a crucial role in the Hindu tradition and are considered real and significant within their cultural and spiritual context, offering profound insights into the beliefs and values of Hinduism.

According to Joseph Campbell, the Indus Valley (2600–1900 BCE) may have left traces in the beliefs and traditions of Hinduism. Artefacts have revealed motifs that are also employed and revered by Hindus today, such as primary male deities worshipped by a ruling elite, mother goddesses, nature spirits, snake worship, as well as the reverence of other theriomorphic (animal-shaped) beings. These themes would be maintained by the Dravidian folk religion even after the decline of its parent civilisation around 1800 BCE.

A major factor in the development of Hinduism was the Vedic religion. The Indo-Aryan migration brought their distinct beliefs to the Indian subcontinent, where the Vedas were composed around 1500 BCE. The Indo-Aryans Vedic pantheon of deities included the chief god Indra, the sun deity Surya, Ushas, as well as Agni.

This period saw the composition of commentaries referred to as the Brahmanas.

According to Williams, from 900 to 600 BCE, the protests of the populace against sacrifices made towards the Vedic gods and rebellions against the Brahmin class led to the embrace of reform by the latter and the composition of the fourth Veda and the Vedanta texts. About half of the Upanishads were mystical and unitive, speaking of experiencing the divine as the one (ekam), while the other half promoted devotion to one or more deities. New gods and goddesses were celebrated, and devotional practices began to be introduced.

Elements such as those emerging from Buddhism and Jainism made their "heteroprax" contributions to later Hindu mythology, such as temples, indoor shrines, and rituals modeled after service to a divine king. Renunciate traditions contributed elements that questioned sacrifices and the killing of animals, and promoted asceticism and vegetarianism. All of these themes would be incorporated by the Brahmin classes into the later Hindu synthesis, which developed in response to the sramanic movements between ca. 500–300 BCE and 500 CE, and also found their way into Hindu mythology.