Tibetans engage with a panoply of divinities and spirits in their daily lives and ritual activities. The word “demon” does not capture the sheer breadth and diversity of these beings because there is a rich assortment of distinct spirit types that cause illnesses, guard against calamities, or possess human mediums to provide clairvoyant advice. While comprehensiveness is impossible, a representative demonology is valuable by offering a foundation for further exploration. Most Tibetan spirits are capricious or overtly pernicious and require oracles, diviners, tantrikas, and other religious specialists to ward off or harness their power. The gods and spirits of Tibet also fit loosely into ontological categories along a larger spectrum that includes enlightened beings, transcendent deities, worldly gods, and fierce demons. The boundaries between these categories are often porous, especially when it comes to aligning certain spirits with buddhas, bodhisattvas, or wrathful deities of the land. For Buddhism and Bön, the two major religious traditions of Tibet, there are specific protector deities with robust mythologies and liturgical corpora that are frequently propitiated and revered in order to maintain these religions both materially and spiritually. Interacting with such divinities often takes the form of oracular ceremonies or image consecrations and offerings. The practices may vary dramatically between spiritual lineages and regions, but the overall concept is rooted in interacting with these powerful forces to effect social, communal, and individual change. In Tibet, spirits are potentially dangerous, but they also offer diverse opportunities for personal advancement and religious enrichment.