IA

IA or ia may mean:
*Individual Augmentee Program that US military uses to inflate numbers of combat soldiers by assigning non-combat occupations as 'augmentees'.
*Internal affairs (law enforcement), a division of a law enforcement agency which investigates incidents and suspicions of lawbreaking and professional misconduct attributed to officers on the force.
*Internal audit, a business profession specializing in the removal of impediments to organizational objectives.
*International Arbiter, a chess title awarded by the World Chess Federation
*Intraarterial injection.
*Indigo Abuse, a radical indigo child forum that closed down in 2006, still referred to affectionately as 'IA' by former members of the site.

;Places
*Ia or Oia, Greece, a small town on the island of Santorini.
*Iowa, U.S.A. (postal abbreviation).

;Companies and organizations

*Iraqi Airways (IATA airline designator).
*Indian Airlines, a domestic air carrier in India.
*Indian Army, part of the Military of India.
*International Academy, a public high-school in Bloomfield Hills, Michigan, U.S.A.
*Inuit Ataqatigiit, a left-wing party in Greenland.
*International Artists, a record label
*Iraqi Army US military abbreviation for Iraqi Army

;Language
*Insha'Allah, Arabic word meaning "If God wills".
*Interlingua (ISO 639 alpha-2, "ia").
*Я (ya), a letter in the Cyrillic alphabet

;Microprocessor designs by Intel
*IA-4, the founding of microprocessors.
*IA-8, microcomputer CPUs of the 1970s.
*IA-16, CISC architecture that established the x86 CPUs.
*IA-32, CISC over RISC architecture found in 32-bit x86 CPUs.
*IA-64, EPIC variant VLIW architecture found in Itaniums.

;People
*Saint Ia, the martyr of Persia in the 4th century a.D.
*Saint Ia of Cornwall.
*Swedish guitarist Mattias "IA" Eklundh.
*ia, a VJ on MTV Japan.

;Biology
*Ia (genus), of vespertilionid bats.

;Internet and information technology
*Intelligence amplification, the process of enhancing human intelligence through the use of technology.
*Information architecture, the practice of structuring information (knowledge or data).
*Information assurance, dealing with trust aspects of information.
*Internet Archive, a non-profit organization dedicated to maintaining an archive of web and multimedia resources.

;Fiction
*The Irken Armada, alien invaders in the 2001-launched TV series "Invader Zim"
*"Invasion America", a 1998 TV series
*"Invasion America" (board wargame), a 1976 game
*"Ia", an 1892 novelette by Arthur Quiller-Couch