| JA | Judge Advocate |
| JAG | Judge Advocate General |
| JCO | Joint Consultative Organisation |
| JD | Doctor of Jurisprudence |
| jl(s) | Joumal(s) |
| jnlst | Journalist |
| JP | Justice of the Peace |
| Jr | Junior |
| JSD | Doctor of Juristic Science |
| JSSC | Joint Services Staff College |
| jt/jtly | joint, jointly |