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Tonsure (/ˈtɒnʃər/) is the practice of cutting or shaving some or all of the hair on the scalp, as a sign of religious devotion or humility. The term originates from the Latin word tōnsūra (meaning "clipping" or "shearing") and referred to a specific practice in medieval Catholicism, abandoned by papal order in 1972. Tonsure can also refer to the secular practice of shaving all or part of the scalp to show support or sympathy, or to designate mourning. Current usage more generally refers to cutting or shaving for monks, devotees, or mystics of any religion as a symbol of their renunciation of worldly fashion and esteem.

Tonsure is still a traditional practice in Catholicism by specific religious orders (with papal permission). It is also commonly used in the Eastern Orthodox Church for newly baptized members and is frequently used for Buddhist novices and monks. It exists as a traditional practice in Islam after completion of the Hajj and is also practiced by a number of Hindu religious orders.

Tonsure is usually the part of three rites of passages in the life of the individual in Hinduism. The first is called Chudakarana (IAST: Cūḍākaraṇa, Sanskrit: चूडाकरण) (literally, rite of tonsure), also known as choulam, caula, chudakarma, or mundana marks the child's first haircut, typically the shaving of the head. The mother dresses up, sometimes in her wedding sari, and with the father present, the baby's head is shaved and nails trimmed, washed and dressed in new clothes. Sometimes, a tuft of hair is left to cover the soft spot near the top of the baby's head. Both boys and girls typically go through this ceremony, sometimes near a temple or a river, but it is not mandatory in Hinduism.

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