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, logo * Indiana Academy, a school * International Academy, Bloomfield Hills, Michigan * International Artists, a record label * ''Internet Archaeology'', an electronic journal * Internet Archive, creators of the Wayback Machine * Iraqi Airways (IATA airline designator IA) * Aircraft model prefix of Fabrica Militar de Aviones#Aircraft Production, ''Fabrica Argentina de Aviones'', e.g. FMA IA 62 * Impact assessment of public policy

Government, law, and military

*Indian Army, the Indian Army *Indonesian Army, the 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 639-2 code: ''ia'') * Romanization#Cyrillic, Romanization of Cyrillic ''Ya (Cyrillic), Я'' letter

People

* Ia or Violet of Persia, fourth-century martyr, feast day September 11 (Eastern Orthodox liturgics), September 11 * Saint Ia of Cornwall * Mattias Eklundh, Swedish guitarist

Places

* Ia or Oia, Greece, Oia, Greece, on Santorini * Iowa, U.S. (postal abbreviation) * 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'' * Industrial archaeology * Iron Age IA I, IA IIA, etc., in Archaeology of Israel#Iron Age / Israelite period, archaeology of Israel

Biology and medicine

* IA (chemotherapy)#Standard-dose cytarabine plus idarubicin (IA or IAC chemotherapy), IA (chemotherapy), with Idarubicin and cytarabine * Ia (genus), ''Ia'' (genus), of vespertilionid bats * Phases of clinical research#Phase I, Phase Ia of a clinical trial * Immunoassay, biochemical test to measure concentrations through antibody or antigen

Computing and electronics

* IA (vocaloid), in software * 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 * 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#Interactions of Actors Theory, 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