IJA
IJA is an acronym for:
- Imperial Japanese Army , see Imperial Japanese Army
- International Journal of Astrobiology , scientific journal published by Cambridge University Press since 2002 ( ISSN 1475-3006 )
- International Jugglers 'Association , founded in 1947 by the international jugglers ' association
- International Journal of Audiology , scientific journal published by Taylor & Francis since 2002 ( ISSN 1708-8186 )
- International Juridical Association , the professional association of attorneys in the United States that existed from 1931 to 1942