| Acronym | Definition |
|---|
| JA | Japan |
| JA | Junior Achievement |
| JA | Jamaica |
| JA | Japanese American |
| JA | Jewelers of America |
| JA | Jane's Addiction (band) |
| JA | Jennifer Aniston (actress) |
| JA | Jagged Alliance (computer game) |
| JA | Jefferson Airplane (band) |
| JA | Jackass |
| JA | Jane Austen |
| JA | Juvenile Arthritis |
| JA | Johnny Appleseed |
| JA | Jedi Academy (Star Wars) |
| JA | Judge Advocate |
| JA | Junior Auxiliary (various locations) |
| JA | Johnston Atoll (virus) |
| JA | John Alexander (Australian tennis champion) |
| JA | Jasmonic Acid (plant growth regulator) |
| JA | Jewish Agency |
| JA | Judicial Assistant (various locations) |
| JA | Job Analysis |
| JA | Joint Appendix (US courts) |
| JA | Just Asking |
| JA | Air Bosna (airline code) |
| JA | Justice Administration (education degree/major) |
| JA | Jesus Army |
| JA | Jack Adapter |
| JA | Journal Asiatique |
| JA | Jump If Above |
| JA | Jump Address |
| JA | Justicia Ambiental |
| JA | Job Alliance |
| JA | Joint Affairs |
| JA | Jetevator Assembly |
| JA | Justified Arsons (gaming clan) |