Est, est, or EST may refer to:

• est: The Steersman Handbook, a science fiction book published in 1970
• Ed Sullivan Theater, New York, built in 1927
• Ensemble Studio Theatre, New York, founded in 1968
• Esbjörn Svensson Trio, a Swedish jazz trio
• E.S.T. (band) [ru], a Soviet and Russian heavy metal band featured in the 1992 film For Those About to Rock: Monsters in Moscow
• E.S.T., a song by British band White Lies from their 2009 album To Lose My Life...
• E.S.T. - Trip to the Moon, a song by Alien Sex Fiend from their 1984 album Acid Bath

• -est, the superlative suffix in English
• -est, an archaic verb ending in English
• Estonian language, an ISO 639 code
• European Society for Translation Studies
• Extended standard theory, a generative grammar framework

• Diana Est (born 1963), an Italian singer
• EST Gee (born 1994), an American rapper
• Michael Est (c. 1580–1648), an English composer
• Thomas Est (c. 1540–1609), an English printer
• Van Est, a Dutch surname
• Estonians, a Finnic ethnic group

• Est Department, a former division of Ivory Coast
• Est Province, Rwanda
• Est Region (Burkina Faso)
• Est Region (Cameroon)

• Est (Chamber of Deputies of Luxembourg constituency), an electoral constituency in Luxembourg
• Est, Netherlands, a town in Gelderland
• Estonia (ISO 3166 alpha-3 code: EST)

• Eastern Canada (French: Est du Canada)

• Edinburgh Science Triangle, a multi-disciplinary partnership in Scotland
• Electroconvulsive therapy, formerly electroshock therapy, a form of treatment
• Endodermal sinus tumor, a cancerous germ cell tumor
• Estrone sulfotransferase, an enzyme catalyzing the transformation of an unconjugated estrogen into a sulfated estrogen
• European Solar Telescope, a proposed observatory
• Expressed sequence tag, a short sub-sequence of a cDNA sequence

• Electron spiral toroid, a claimed small stable plasma toroid
• Electronic sell-through, a method of media distribution
• Enrollment over Secure Transport, a cryptographic protocol

• Eastern Standard Time (UTC−5)
• European Summer Time (from UTC to UTC+3)
• Egypt Standard Time (UTC+2)
• Australian Eastern Standard Time (UTC+10)

• Eastern Sierra Transit, a transit agency in California
• Energy Saving Trust, a British organization for fighting climate change, formed in 1992
• Erhard Seminars Training (est), a New Age large-group awareness training program, 1971–1984
• Espérance Sportive de Tunis, a Tunisian multi-sports club, founded in 1919
• Est Cola, a Thai soft drink, launched in 2012
• Effort satisficing theory, a decision-making strategy; see Satisficing § Effort satisficing theory

• Est! Est!! Est!!!, an Italian wine appellation
• East (disambiguation)