Shamanism or Samanism is a religious practice that involves a practitioner (shaman or saman) interacting with the spirit world through altered states of consciousness, such as trance. The goal of this is usually to direct spirits or spiritual energies into the physical world for the purpose of healing, divination, or to aid human beings in some other way.

Beliefs and practices categorized as "shamanic" have attracted the interest of scholars from a variety of disciplines, including anthropologists, archeologists, historians, religious studies scholars, philosophers and psychologists. Hundreds of books and academic papers on the subject have been produced, with a peer-reviewed academic journal being devoted to the study of shamanism.

In the 20th century, non-Indigenous Westerners involved in countercultural movements, such as hippies and the New Age created modern magicoreligious practices influenced by their ideas of various Indigenous religions, creating what has been termed neoshamanism or the neoshamanic movement. It has affected the development of many neopagan practices, as well as faced a backlash and accusations of cultural appropriation, exploitation and misrepresentation when outside observers have tried to practice the ceremonies of, or represent, centuries-old cultures to which they do not belong.