Xenoglossy, also written xenoglossia and sometimes also known as xenolalia, is the supposedly paranormal phenomenon in which a person is allegedly able to speak, write or understand a foreign language that they could not have acquired by natural means. The term derives from the Ancient Greek xenos (ξένος), "foreigner" and glōssa (γλῶσσα), "tongue" or "language". The term xenoglossy was first used by French parapsychologist Charles Richet in 1905. Accounts of xenoglossy are found in the New Testament, and contemporary claims have been made by parapsychologists and reincarnation researchers such as Ian Stevenson. Doubts have been expressed that xenoglossy is an actual phenomenon, and there is no scientifically admissible evidence supporting any of the alleged instances of xenoglossy.

Ian Pretyman Stevenson was a Canadian-born American psychiatrist, the founder and director of the Division of Perceptual Studies at the University of Virginia School of Medicine. He was a professor at the University of Virginia School of Medicine for fifty years. He was chair of their department of psychiatry from 1957 to 1967, Carlson Professor of Psychiatry from 1967 to 2001, and Research Professor of Psychiatry from 2002 until his death in 2007.