Hair removal is the deliberate removal of body hair or head hair. This process is also known as epilation or depilation.

Hair is a common feature of the human body, exhibiting considerable variation in thickness and length across different populations. Hair becomes more visible during and after puberty. Additionally, men typically exhibit thicker and more conspicuous body hair than women. Both males and females have visible body hair on the head, eyebrows, eyelashes, armpits, genital area, arms, and legs. Males and some females may also have thicker hair growth on their face, abdomen, back, buttocks, anus, areola, chest, nostrils, and ears. Hair does not generally grow on the lips, back of the ear, the underside of the hands or feet, or on certain areas of the genitalia.

Hair removal may be practiced for cultural, aesthetic, hygienic, sexual, medical, or religious reasons. Forms of hair removal have been practiced in almost all human cultures since at least the Neolithic era. The methods used to remove hair have varied in different times and regions.

The term "depilation" is derived from the Medieval Latin "depilatio," which in turn is derived from the Latin "depilare," a word formed from the prefix "de-" and the root "pilus," meaning "hair."

For centuries, hair removal has long shaped gender roles, served to signify social status and defined notions of femininity and the ideal "body image". In early periods, the condition of being hairless was mostly done as a way to keep the body clean, using flint, seashells, beeswax and various other depilatory utensils and exfoliator substances, some highly questionable and highly caustic. Ancient Rome also associated hair removal with status: a person with smooth skin was associated with purity and superiority. Removing body hair was done by both men and women. Psilothrum or psilotrum (Ancient Greek: ψίλωθρον) and dropax (Ancient Greek: δρῶπαξ) were depilatories in ancient Greece and Rome. An alipilus (Ancient Greek: παρατίλτριος) was a slave who attended bathers, removing unwanted body hair. The same practice applied to women, who were served by female slaves called παρατίλτριαι (the plural of παρατίλτρια, the feminine form of παρατίλτριος).

In Ancient Egypt, besides being a fashion statement for affluent Egyptians of all genders, hair removal served as a treatment for louse infestation, which was a prevalent issue in the region. Very often, they would replace the removed head hair with a Nubian wig, which was seen as easier to maintain and also fashionable. Ancient Egyptian priests also shaved or depilated all over daily, so as to present a "pure" body before the images of the gods.^{[citation needed]}

In ancient times, one highly abrasive depilatory paste consisted of an admixture of slaked lime, water, wood-ash and yellow orpiment (arsenic trisulfide); In rural India and Iran, where this mixture is called vajibt, it is still commonly used to remove pubic hair. In other cultures, oil extracted from unripe olives (which had not reached one-third of their natural stage of ripeness) was used to remove body hair.

During the medieval period, Catholic women were expected to let their hair grow long as a display of femininity, whilst keeping the hair concealed by wearing a wimple headdress in public places. The face was the only area where hair growth was considered unsightly; 14th-century ladies would also pick off hair from their foreheads to recede the hairline and give their face a more oval form. From the mid-16th century, it is said when Queen Elizabeth I came to power, she made eyebrow removal fashionable.