A dakini (Sanskrit: डाकिनी ḍākinī; Tibetan: མཁའ་འགྲོ་མ་ khandroma, Wylie: mkha' 'gro ma, TP: kanzhoima; Chinese: 空行母) is a tantric deity described as a female embodiment of enlightened energy. In the Tibetan language, dakini is rendered khandroma which means 'she who traverses the sky' or 'she who moves in space'. Sometimes the term is translated poetically as 'sky dancer' or 'sky walker'.

The dakini, in all her varied forms, is an important figure in Tibetan Buddhism. She is so central to the requirements for a practitioner to attain full enlightenment as a Buddha that she appears in a tantric formulation of the Buddhist Three Jewels refuge formula known as the Three Roots. Most commonly she appears as the protector, alongside a guru and yidam, but Judith Simmer-Brown points out that:

The dakini, in her various guises, serves as each of the Three Roots. She may be a human guru, a vajra master who transmits the Vajrayana teachings to her disciples and joins them in samaya commitments. The wisdom dakini may be a yidam, a meditational deity; female deity yogas such as Vajrayogini are common in Tibetan Buddhism. Or she may be a protector; the wisdom dakinis have special power and responsibility to protect the integrity of oral transmissions