IA, Ia, or ia may refer to:
Arts and entertainment Ia, an 1892 novelette by Arthur Quiller-Couch "Iä", a fictional word in the works of H. P. Lovecraft International Alliance of Theatrical Stage Employees (IATSE), which also goes by IA International Artists, a record label
Businesses and organizations Indian Airlines, defunct airline, 1953-2011 Indiana Academy, high school in Cicero, Indiana International Academy, high school in Bloomfield Hills, Michigan Internet Archive, online digital library and host organization of the Wayback Machine Iraqi Airways, known by the IATA airline designator IA Impact assessment of public policy Insurance Authority, a statutory body in Hong Kong Aircraft model prefix of Fabrica Argentina de Aviones, e.g. FMA IA 62
Government, law, and military Indian Army Indonesian Army Individual augmentee, U.S. military person temporarily assigned to a unit Indecent assault, sexual criminal offense
Language Ia (cuneiform), a sign in cuneiform writing Inter alia (i.a.), Latin meaning "among other things" Interlingua (ISO 639-1 code: ia) Romanization of Cyrillic Я letter Inshallah (iA), used by English-speaking Muslims.
People Saint Ia of Cornwall Mattias Eklundh, Swedish guitarist
Places Iowa (IA), U.S. state, postal abbreviation Indiana (Ia), U.S. state, older traditional abbreviation Ia or Oia, Greece, on Santorini Iá River, a river in Brazil
Science and technology
Archaeology Institute of Archaeology, Chinese Academy of Social Sciences (IA) IA, The Journal of the Society for Industrial Archeology Internet Archaeology, an electronic journal Industrial archaeology Iron Age, an archaeological period
Biology and medicine IA (chemotherapy), with Idarubicin and cytarabine Ia (genus), of vespertilionid bats Phase Ia of a clinical trial Immunoassay, biochemical test to measure concentrations through antibody or antigen
Computing and electronics IA (software), a vocaloid (singing synthesizer) IA-32, Intel Architecture, 32-bit IA-64, Intel Architecture, 64-bit Implicit authentication, by a smart device Human intelligence amplification through technology Intelligent agent, in artificial intelligence Artificial intelligence, abbreviated IA in several other languages Information architecture, the structural design of shared information Information assurance, dealing with trust aspects of information
Other uses in science and technology Group IA (or Ia), an obsolete designation for the group 1 elements Type Ia supernova, a subtype of Type I supernova Interactions of actors theory, by Gordon Pask
Other uses Internal affairs (disambiguation) Intermediate in Arts, an academic degree Internal audit of an organization's operations International affairs, alternative term for International relations, the study of politics, economics and law on a global level Íþróttabandalag Akraness or ÍA, an Icelandic football team Mazda2, a 2002–present Japanese subcompact car, sold in North America as the Scion iA and Toyota Yaris iA
See also 1A (disambiguation) AI (disambiguation)