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{{wiktionary|er|Er|ER|-er|'er|er-}}

'''ER''' or '''Er''' may refer to:

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==People==
* [[E. R. Eswaran]] (born 1961), Indian politician and entrepreneur from Tamil Nadu
* [[Nie Er]] (1912–1935), Chinese composer
* Er, a character in Plato's ''[[Myth of Er]]''
* [[Er (biblical person)]], the eldest son of Judah in the Biblical Book of Genesis
* ''Eduardus Rex'', the Latin form of [[King Edward (disambiguation)|King Edward]]
* ''Elizabeth Regina'', the Latin form of [[Queen Elizabeth (disambiguation)|Queen Elizabeth II]]
* [[Èrs people|Èr]], an ancient people inhabiting parts of what are now northern Armenia, northeast Turkey, southern Georgia, and northwest Azerbaijan

==Places==
* Country code associated with Eritrea in [[ISO 3166-2:ER|ISO 3166]] standard
* [[East Rochester, New York]]

==Language==
* ''-er'', a suffix added to adjectives or adverbs to form a [[comparative]] (e.g. ''fast'' to ''faster'')
* ''-er'', a suffix added to a verb to make it an [[agent noun]] (e.g. ''cut'' to ''cutter'')
* [[Oxford "-er"]], a suffix used to form words like ''rugger'' and ''footer''
* "er", a [[filler (linguistics)]]
* [[Er (Cyrillic)]] ('''P'''&nbsp;/&nbsp;'''p'''), a letter of the Cyrillic alphabet corresponding to the Latin letter "R"
* Er, alternate spelling for [[Yer]] ('''Ъ'''&nbsp;/&nbsp;'''ъ'''), the hard-sign letter of the Cyrillic alphabet
* Er., Hebrew abbreviation for 'Eruvin, the second tractate of [[Moed]]
* ER, Spanish language abbreviation for [[Entre Ríos (disambiguation)|Entre Ríos]]

==Media and entertainment==
* [[ER (TV series)|''ER'' (TV series)]], a 1994–2009 American television medical drama series
* ''[[E/R]]'', a 1984–1985 American television sitcom
* ''Er'', an album by [[Nils Petter Molvær]]
* "ER", a song by Royce da 5'9" featuring Kid Vishis from ''[[Success Is Certain]]''
* ''[[Chico Enterprise-Record]]'', the daily newspaper of Chico, California

==Science and medicine==
* Acronym for [[Emergency room]], a medical facility specializing in acute care
* <math>\epsilon_r</math>, a representation for [[Relative static permittivity]]
* [[Electrorheological fluid|Electrorheological (ER) fluid]], a type of chemical suspension
* [[Endoplasmic reticulum]], a type of organelle in cell biology
* [[Enantiomeric ratio]], a concept in chemistry
* [[Equine exertional rhabdomyolysis]], a syndrome that damages muscle tissue in horses
* [[Estrogen receptor]], a type of protein molecule
* [[Evidential reasoning approach]], a concept in Decision Theory
* [[Extended release]], a mechanism used to release a drug over time
* [[Extraction ratio]], a pharmacokinetic property
* Symbol for chemical element [[Erbium]] on the periodic table

==Technology and computing==
* [[.er]], country code top-level domain  (ccTLD) for Eritrea
* [[Engine room]], shipbuilding abbreviation
* [[Engineer]], a profession that develops solutions to technical problems
* [[Entity–relationship model]], a conceptual representation of data
* [[Erdős–Rényi model]] a model in graph theory
* Error Resilience, an audio coding method used in [[MPEG-4 Part 3]]

==Other uses==
* Acronym for [[English Reports]] of the English Courts from 1220 to 1866
* [[Earned run]], a term in the game of baseball
* [[Estonian Reform Party]]
* IATA designator for [[Astar Air Cargo]]
* Reporting mark for the [[Entre Ríos Railway]] in Argentina

==See also==
* [[Err (disambiguation)]]
* [[Erro (disambiguation)]]
* [[Error (disambiguation)]]
* [[Ur (disambiguation)]]

{{disambiguation}}