| Acronym | Meaning |
 | JT | Johnston Atoll (ISO 3166 Digram; Obsolete 1986) -Junior Technician (RAF) |
| JTAGS | Joint Tactical Ground Station (djay-tagz) |
| JTC | Joint Training Confederation |
| JTF | Joint Task Force |
| JTFEX | Joint Task Force Exercise |
| JTIDS | Joint Tactical Information Distribution System (djay-tidz) |
| JTLS | Joint Theater Level Simulation |
| JTMD | Joint Theatre Missile Defence |
| JTN | Johnston Atoll (ISO 3166 Trigram; Obsolete 1986) |
| JTRS | Joint Tactical Radio System (jitters) |
| JU | Juan De Nova Island (FIPS 10-4 Territory Code) |
| JUGFET | JUnction Gate Field-Effect Transistor |
| JUO | Joint Urban Operations |
| JV | Joint Venture - Junior Varsity |
| JV | Javanese Language (ISO 639-1 Code) |
| JVM | Java Virtual Machine |
| JW | Jehovah's Witnesses |
| JWARS | Joint Warfare System (simulation) |
| JWP | Joint Warfare Publication |
| JWST | James Webb Space Telescope |
| JY | Japanese Yen |
| JZ | Joint Zone |
| K | Kelvin - Potassium (Latin Kalium) - Tanker (aircraft Designation Code) |
| K | Kilo |
| K/T | Cretaceous/Tertiary Boundary |
| K9 | Canine Police Unit |
| KA | Knowledge Acquisition |
| KA | Georgian Language (ISO 639-1 Code) |
| KA | Kamov Design Bureau |
| KA | Kiloampere |
| KAF | Kandahar Air Field |
| KAL | Kalaallisut Language (ISO 639-2 Code) |
| KAN | Kannada Language (ISO 639-2 Code) |
| KARNAC | Knowledge Aided Retrieval In Activity Context |
| KAS | Kashmiri Language (ISO 639-2 Code) |
| KAT | Georgian Language (ISO 639-2 Code) |
| KATUSA | Korean Augmentation To United States Army |
| KAU | Kanuri Language (ISO 639-2 Code) |
| KAZ | Kazakh Language (ISO 639-2 Code) |
| KAZ | Kazakhstan (ISO 3166 Trigram) |
| KBE | Knight Commander Of The Order Of The British Empire |
| KBO | Kuiper Belt Object |
| KC | Kilocoulomb |
| KCK | Kansas City |
| KCL | King's College London |
| KCMO | Kansas City |
| KD | Kawasaki Disease - Kraft Dinner |
| KE | Kenya (FIPS 10-4 Country Code; ISO 3166 Digram) -Kinetic Energy - Knowledge Engineering |
| KEDO | Korean Peninsula Energy Development Organization |
| KEN | Kenya (ISO 3166 Trigram) |
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