| J Toxicol Sci | Journal of Toxicological Sciences (Japan) 
| Others |
| J# | J-sharp
| Others |
| J# | J-sharp programming language
| Others |
| J# | Judd Number
| Others |
| J&A | Jacobson & Associates, L.L.C.
| Others |
| J&A | Jaekel & Associates, LTD.
| Others |
| J&A | Jahani and Associates
| Others |
| J&A | Jindal & Associates (Management Consultants) Pvt., Ltd.
| Others |
| J&A | Justification and Approval
| Others |
| J&D | Jaguar and Daimler
| Others |
| J&S | Judgment and Sentence
| Others |
| J&W | Jeeps and Wrenches
| Others |
| J-1 | Manpower and Personnel Directorate of A Joint Staff
| Others |
| J-1 | Manpower and Personnel Staff Section
| Others |
| J-2 | Intelligence Directorate of A Joint Staff
| Others |
| J-2 | Intelligence Staff Section
| Others |
| J-2A | Deputy Directorate For Administration of A Joint Staff
| Others |
| J-2J | Deputy Directorate For Support of A Joint Staff
| Others |
| J-2M | Deputy Directorate For Crisis Management of A Joint Staff
| Others |
| J-2O | Deputy Directorate For Crisis Operations of A Joint Staff
| Others |
| J-2P | Deputy Directorate For Assessment, Doctrine, Requirements, and Capabilities of A Joint Staff
| Others |
| J-2T | Deputy Directorate For Targeting, Joint Staff Intelligence Directorate
| Others |
| J-2T-1 | Joint Staff Target Operations Division
| Others |
| J-2T-2 | Target Plans Division
| Others |
| J-2X | Joint Force Counterintelligence and Human Intelligence Staff Element
| Others |
| J-3 | Operations Directorate of A Joint Staff
| Others |
| J-3 | Operations Staff Section
| Others |
| J-4 | Logistics Directorate of A Joint Staff
| Others |
| J-4 | Logistics Staff Section
| Others |
| J-5 | Plans Directorate of A Joint Staff
| Others |
| J-5 | Plans Staff Section
| Others |
| J-6 | Command, Control, Communications, and Computer Systems Staff Section
| Others |
| J-6 | Communications System Directorate of A Joint Staff
| Others |
| J-7 | Engineering Staff Section
| Others |
| J-7 | Joint Staff Operational Plans and Joint Force Development Directorate
| Others |
| J-7 | Operational Plans and Interoperability Directorate of A Joint Staff
| Others |
| J-8 | Director For Force Structure, Resource, and Assessment, Joint Staff
| Others |
| J-8 | Force Structure, Resource, and Assessment Directorate of A Joint Staff
| Others |
| J-9 | Civil-Military Operations Directorate of A Joint Staff
| Others |
| J-9 | Civil-Military Operations Staff Section
| Others |
| J-A | Judge Advocate Directorate of A Joint Staff
| Others |
| J-ART | Japanese Adverse Reaction Terminology
| Others |
| J-BOSC | Joint Base Operations and Support Contract
| Others |
| J-CCCP | Japan-Caribbean Climate Change Partnership
| Others |
| J-COARE | Japanese Coupled Ocean-Atmosphere Response Experiment
| Others |
| J-DIPC | Joint Deployable Intelligence Processing Capability
| Others |
| J-LT | Journal of Lightwave Technology
| Others |
| J-MASS | Joint Mobility Analysis Support System
| Others |
| J-MEMS | IEEE/ASME Journal of MicroElectroMechanical Systems
| Others |
| J-NET | Juvenile Network System
| Others |