Salvia divinorum (also known as Diviner's Sage, Ska María Pastora, Seer's Sage, and by its genus name Salvia) is a psychoactive plant which can induce dissociative effects and is a potent producer of "visions" and other hallucinatory experiences. Its native habitat is within cloud forest in the isolated Sierra Mazateca of Oaxaca, Mexico, where it grows in shady and moist locations. The plant grows to over a meter high, has hollow square stems, large leaves, and occasional white flowers with violet calyxes. Botanists have not determined whether Salvia divinorum is a cultigen or a hybrid; native plants reproduce vegetatively, rarely producing viable seed.

Mazatec shamans have a long and continuous tradition of religious use of Salvia divinorum, using it to facilitate visionary states of consciousness during spiritual healing sessions. Most of the plant's local common names allude to the Mazatec belief that the plant is an incarnation of the Virgin Mary, with its ritual use also invoking that relationship. Its active psychoactive constituent is a structurally unique diterpenoid called salvinorin A, a potent κ-opioid and D₂ receptor agonist. Salvia divinorum is generally understood to be of low toxicity (high LD₅₀) and low addictive potential since it is a κ-opioid agonist.