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{{distinguish|text=[[I0 (disambiguation)]] (the letter I followed by zero)}}
{{wiktionary|-io|IO|Io|io}}
'''Io''' most commonly refers to:
* [[Io (moon)]], a moon of Jupiter
* [[Io (mythology)]], daughter of Inachus in Greek mythology, and lover of Zeus who was turned into a cow
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'''Io''', '''IO''', '''iO''', '''I/O''', '''i/o''', or '''i.o.''' may also refer to:
==Arts, entertainment and media==
===Fictional elements===
*[[Scylla Io]], one of Poseidon's Marine Generals in the ''Saint Seiya'' series
*A [[List of Dungeons & Dragons dragon deities#Io|''Dungeons & Dragons'' dragon deity]]
*Io Otonashi, a main character in the Japanese manga series ''[[Place to Place]]'' (''Acchi Kocchi'')
*Io Nitta, a character in the game ''[[Shin Megami Tensei: Devil Survivor 2]]''
===Gaming===
*''iO'', a 2014 video game by [[Gamious]]
*[[IO Interactive]], a Danish computer game developer
===Music===
*[[IO (German band)]], a German band
*[[Io (English band)]], an English band
*[[I_o (musician)]], an American DJ and record producer (1990–2020)
*[[i/o (Peter Gabriel album)|''i/o'' (Peter Gabriel album)]], 2023
===Theatre and opera===
*[[Io (opera)|''Io'' (opera)]], an unfinished ''acte de ballet'' (opera) by Jean-Philippe Rameau
*[[iO Theater]] (ImprovOlympic), a theater in Chicago, Illinois, dedicated to improvisational comedy
*[[IO West]], a Los Angeles theater associated with the Chicago iO
===Other uses in arts, entertainment and media===
*[[EO (film)|''EO'']] (original Polish title: ''IO''), a 2022 Jerzy Skolimowski film
*[[Io (film)|''Io'' (film)]], a 2019 Netflix film
*[[iO Digital Cable Service]], a service offered by Cablevision
*''[[International Organization]]'', a peer-reviewed journal that covers the entire field of international affairs
==Business and economics==
*[[Industrial and organizational psychology]], the field of psychology that studies work, academic, and other organizational issues
*[[Industrial organization]], the field of economics that studies the strategic behavior of firms, the structure of markets and their interactions
*[[wiktionary:insertion order|Insertion order]], a business document specifying the inventory goal of an advertising campaign
*[[Integrated operations]], a term used in the petroleum industry describing new work processes and ways of working that have been facilitated by modern information and communication technologies
*Interest-only, a type of [[collateralized mortgage obligation]] (CMO) or mortgage-backed security
==Language==
*[[i.o.]], ''{{lang|la|in illo ordine}}'', Latin phrase meaning "respectively" ("in that order")
*[[Io (princely title)]], a particle of a title used by Moldavian and Wallachian Princes-regnant
*[[Ido language]] (ISO 639-1 language code IO), a constructed language
*[[Indirect object]], the object that is the recipient of an action (by a verb)
*[[Yo (Cyrillic)|Yo]], also referred to as Io
==Mythology==
*[[Io (mythology)]], daughter of Inachus in Greek mythology, and lover of Zeus who was turned into a cow
*Io, an alternate spelling of the nereid [[Ino (Greek mythology)|Ino]], later known as Leukothea, who in the Odyssey gave Odysseus a veil that allowed him to breathe underwater
*[[Io Matua Kore]], in some Māori traditions the supreme god
==People==
*{{Nihongo|[[Io Murota]]|室田 伊緒||born 1989}}, Japanese shogi player
*{{Nihongo|[[Io Sakisaka]]|咲坂 伊緒}}, Japanese manga artist
*[[Io Shirai]] (born 1990), Japanese professional wrestler
*{{Nihongo|[[Iou Kuroda]]|黒田 硫黄||born 1971}}, Japanese manga artist
*[[iO Tillett Wright]] (born 1985), American artist, director, photographer, writer, film maker, activist, and actor
==Places on Earth==
*[[British Indian Ocean Territory]], ISO 3166-1 alpha-2 code
*[[Io (island)]], an uninhabited islet near Crete, Greece
*[[Io, Norway]], a village in Alver, Norway
*[[Mount Iō (disambiguation)]], name of several mountains in Japan
*[[Indian Ocean]]
==Science and technology==
===Astronomy===
*[[Io (moon)]], a moon of Jupiter
*[[85 Io]], an asteroid
===Biology and medicine===
*[[Io (gastropod)|''Io'' (gastropod)]], a genus of freshwater snail in the family Pleuroceridae
*[[Io (plant)|''Io'' (plant)]], a genus of plant in the tribe [[Senecioneae]]
*''[[Automeris io]]'', a moth species in North America
*''[[Aglais io]]'', the European peacock butterfly
*[[Intraosseous infusion]], the medical process of introducing medication directly into the bone marrow
*[[Hawaiian hawk]] ({{langx|haw|{{okina|link=no}}io|links=no}})
*[[Cancer immunotherapy|Immuno-oncology]], another term for cancer immunotherapy
===Computing===
*[[.io]], the Internet country code top-level domain (ccTLD) for the British Indian Ocean Territory
*[[Io (programming language)]], a pure object-oriented programming language
*[[IO.SYS]], a system file in Microsoft DOS and Windows 95, 98 and ME
*[[Indistinguishability obfuscation]], a cryptographic tool to obscure computer code
*[[Input/output]], the collection of interfaces that different functional units of an information processing system use to communicate with each other
===Other uses in science and technology===
*[[Ionium]] (symbol Io), a claimed chemical element that was later realized to be thorium-230
*[[Iodine monoxide]] (symbol IO)
*[[Image orthicon tube]], a TV camera used between 1946 and 1968
*Infinitely often, a mathematics term sometimes written "i.o."; see an example in [[set-theoretic limit]]
==Other uses==
*[[Bureau of International Organization Affairs]], in the U.S. Department of State
*[[Government Printing Bureau (Macau)]], known in Portuguese as the ''Imprensa Oficial'' or "IO"
*[[Indonesian Airlines]] (IATA airline designator IO)
*Investigating Officer, a member of [[law enforcement in the United Kingdom]] who heads an investigation
*[[Mitsubishi Pajero iO]], a mini SUV model produced by Mitsubishi Motors
*[[IO (Oral-B)]], a series of electric toothbrushes by Oral-B
==See also==
*[[Ю]] or yu, a Cyrillic letter
*[[I/O (disambiguation)]]
*[[IOS (disambiguation)]]
*[[I0 (disambiguation)]] (the letter "I" followed by the digit "0")
*[[10 (disambiguation)]] (the digit "1" followed by the digit "0")
*[[1O (disambiguation)]] (the digit "1" followed by the letter "O")
{{Disambiguation|geo|given name}}
[[Category:Japanese feminine given names]]
[[Category:Feminine given names]]