Gymnosophists (γυμνοσοφισταί, gymnosophistaí, i.e. "naked philosophers" or "naked wise men" (from Greek γυμνός gymnós "naked" and σοφία sophía "wisdom")) is the name given by the Greeks to certain ancient Indian philosophers who pursued asceticism to the point of regarding food and clothing as detrimental to purity of thought. They were noted to have been vegetarian by several Greek authors. There were also gymnosophists in Upper Egypt who were called Ethiopean Gymnosophists by Apollonius of Tyana.
In Greek literature, they are mentioned in association with the Persian magi, the Chaldaeans of the Assyrians or the Babylonians, the druids of the Celts, and the priests of Egypt. Some sources claim that famous figures such as Lycurgus, Pythagoras, and Democritus may have met them. They are mentioned by authors such as Philo, Lucian, Clement of Alexandria, Philostratus, and Heliodorus of Emesa. These reports are thought to have served as models to Cynics as well as Christian ascetics. Many authors have discussed the purported questions by Alexander the Great and answers by the Gymnosophists.
The term gymnosophist was used by Plutarch (c. 46–120 CE) in the 1st century CE, when describing an encounter by Alexander the Great with ten gymnosophists near the banks of the Indus river in what is now Pakistan.
He (Alexander) captured ten of the gymnosophists who had done most to get Sabbas to revolt, and had made the most trouble for the Macedonians. These philosophers were reputed to be clever and concise in answering questions, and Alexander therefore put difficult questions to them, declaring that he would put to death him who first made an incorrect answer, and then the rest, in an order determined in like manner; and he commanded one of them, the oldest, to be the judge in the contest. The first one, accordingly, being asked which, in his opinion, were more numerous, the living or the dead, said that the living were, since the dead no longer existed. The second, being asked whether the earth or the sea produced larger animals, said the earth did, since the sea was but a part of the earth.