JA
- ja – (s) Japanese language (ISO 639-1 code)
- JA – (s) Japan (FIPS 10-4 country code)
- JAFT – (s) Just A Field Test
- JAG – (a) Judge Advocate General Corps (military law)
- JAL – (p) Japan Airlines
- JALLC – (a) Joint Analysis and Lessons Learned Centre (NATO)
- JAM – (s) Jamaica (ISO 3166 trigram)
- JAMA – (i) Journal of the American Medical Association
- JANET – (p) Joint Academic Network
- JANUS – (a) Joint Academic Network Using Satellites (UK) – Joint Army Navy Uniform Simulation – (p) Joint Army-Navy Staff – Just ANother Useless Simulation (Note: The U.S. Army Janus simulation is not an acronym)
- JATO – (a) Jet-Assisted Take-Off
- jav – (s) Javanese language (ISO 639-2 code)
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