Tan or TAN may refer to:
Math Tangent function, a trigonometric function often referred to as tan.
Arts and entertainment Tan, a 1989 album by the Polish rock band Kult "Tan", a 2026 song by the Scythe from the album Strictly 4 the Scythe TAN (group), South Korean boy band Tan (newspaper), a newspaper in Turkey Tan (weekly newspaper), a newspaper in Kosovo
Businesses and organisations TAN Books, a Catholic publishing company FC Rubin-TAN Kazan, a Russian professional ice hockey club in Kazan in 1991-94 Transportes Aéreos Nacionales or TAN Airlines, an airline based in Honduras Semitan or TAN, operates public transport in Nantes, France
People Tan (surname) (譚), a Chinese surname Chen (surname) (陳), a Chinese surname, pronounced "Tan" in Min Nan languages Laozi, posthumous name "Tan" or "Dān" (聃), philosopher of ancient China Leborgne, nicknamed Tan, a patient of Paul Broca's, on whose autopsy he identified Broca's area Mika Tan (born 1977), an American model TAN (musician) (born 1990), Malaysian pop singer Tan Sağtürk (born 1969), Turkish ballet dancer Tan France (born 1983), British-American fashion designer
Places China Tan (state), an ancient viscountcy in eastern Shandong Province, China Tai'an railway station (Shandong), China Railway code TAN
Vietnam Tân An, Bắc Giang, a northeastern commune and village Tân An, the capital city of Long An Province, Mekong Delta Tân An province, a former province of South Vietnam
Elsewhere Tan Track or "The Tan", a running track in Royal Botanic Gardens, Melbourne, Australia Tanzania (IOC and FIFA trigram: TAN), a country Taunton Municipal Airport (IATA airport code: TAN), Massachusetts, US
Science and technology Tan (color), a pale shade of brown Tanning (leather), the process of making leather from hides Tan (function), a trigonometric function Ti-6Al-7Nb, a titanium alloy containing aluminum and niobium Total acid number (TAN), the measure of a lubricant's or crude oil's acidity Transaction authentication number (TAN), in electronic banking Tumor-associated neutrophil
Biology Tan (goat pattern), a goat color pattern Tanbark or tan, the bark of certain species of tree Sun tanning, the darkening of skin in response to ultraviolet light Sunless tanning, the darkening of skin without ultraviolet light Tropical ataxic neuropathy
Other uses -tan, a Japanese honorific Tahn (Armenian tʻan), a yoghurt-based drink from the Middle East Tanfana or Tan, an ancient European goddess Tax Deduction and Collection Account Number (TAN), an Indian tax code
See also Black and Tans, a nickname for British special constables during the Irish War of Independence Irish War of Independence, sometimes called the "Black and Tan war" or "Tan war" Taan (disambiguation) Dan (disambiguation) (Tan is the older romanization of Dan in Chinese) Tannin (disambiguation) Tanning (disambiguation) TANS (disambiguation) Tanzhou (disambiguation), a Chinese placename "Tan District" or "Tan City"