IJA may refer to:
*
Imperial Japanese Army
* ''
International Journal of Astrobiology''
*
International Jugglers' Association
* ''
International Journal of Audiology
The ''International Journal of Audiology'' is a monthly peer-reviewed medical journal covering research in audiology, including psychoacoustics, anatomy, physiology, cellular and molecular biology, genetics, neuroscience, speech and hearing scien ...
''
*
International Juridical Association (1931–1942)
{{disambiguation