Mohiniyattam is an Indian classical dance form originating from the state of Kerala. The dance gets its name from Mohini—the female enchantress avatar of the Hindu deity Vishnu, who helps the devas prevail over the asuras using her feminine charm.

Mohiniyattam's roots, like all classical Indian dances, are in the Natya Shastra—the ancient Hindu Sanskrit text on performance arts. However, it follows the Lasya style described in Natya Shastra, that is a dance which is delicate, eros-filled and feminine. It is traditionally a solo dance performed by women after extensive training, though men also perform the dance in the contemporary period. The repertoire of Mohiniyattam includes music in the Carnatic style, singing, and acting a play through the dance, where the recitation may be either by a separate vocalist or the dancer themselves. The song is typically in Malayalam-Sanskrit hybrid called Manipravalam.

The earliest mention of the word is found in the 16th-century legal text Vyavahāramālā, but the likely roots of the dance are older. The dance was systematized in the 18th century, but was then ridiculed as a Devadasi prostitution system during the colonial British Raj; it was banned by a series of laws from 1931 through 1938, which was protested and partially repealed in 1940. The socio-political conflict ultimately led to the renewed interest in and the revival and reconstruction of Mohiniyattam by the people of Kerala, particularly the poet Vallathol Narayana Menon.

Mohiniyattam, also referred to as Mohini-attam, is derived from "Mohini" – a famous female avatar of the Hindu god Vishnu in Indian mythology.

Mohini refers to a divine enchantress or a supreme seductress. She appears in Hindu mythologies during a battle between Devas (good) and Asuras (evil), after the evil had won control of Amrita (nectar of immortality). Appearing in her youthful bloom, dressed rapturously she uses her charms to seduce the Asuras, who seeking her favors, give her the Amrita to distribute among the evil forces. Mohini after gaining the Amrita gives it to the good instead, depriving the evil from gaining immortality.

The details of the Mohini story varies by the Purana and region, but she is consistently an enchantress avatar of the supreme in Vaishnavism. Aattam is a Malayalam language word, and means rhythmic motion or dance. Mohiniyattam thus connotes "a dance of an enchantress, a beautiful woman".

Mohiniyattam is a classical Indian dance, which by definition traces its repertoire to the foundational text Natya Shastra. The Natya Shastra text is attributed to the ancient scholar Bharata Muni. Its first complete compilation is dated to between 200 BCE and 200 CE, but estimates vary between 500 BCE and 500 CE. The text describes the basic elements and the structure of two types of dance: the vigorous, high energy Tāṇḍava dance (Shiva) and the gentle, calmingly graceful Lāsyā dance (Parvati, Shiva's lover). Mohiniyāttam follows the structure and aims of the Lāsyā dance in Natya Shastra.

According to Reginald Massey, Mohiniyattam's history is unclear. Kerala, the region where this dance genre developed and is popular, has a long tradition of lasya style dances whose basics and structure may be at the root. The earliest evidence of Mohiniyattam, or a Mohiniyattam-like dance tradition is found in temple sculpture of Kerala. The 11th century Vishnu temple at Trikodithanam, and the Kidangur Subramanya temple, have several sculptures of female dancers in Mohiniyattam pose. The textual evidence from 12th century onwards suggest that Malayalam poets and playwrights included Lāsyā themes. The 16th century Vyavaharamala by Nambootiri contains the first known mention of the term Mohiniyattam, in the context of a payment to be made to a Mohiniyattam dancer. Another text, Gosha Yatra, from the 17th century too mentions the term. The 18th century Balarama Bharatam, a major secondary work on Natya Shastra composed in Kerala, mentions many dance styles including Mohini Natana.