| Abbreviation | Definition |
|---|---|
| JGS | Jewish Genealogy Society |
| JL | Jeep Lover |
| JLC | Joy Luck Club |
| JLRA | Jaguar Land Rover Australia |
| JM | Junior Member |
| JMH | Johannesburg Meccano Hobbyists |
| JMI | John Moores Interests |
| J-RPG | Japanese Role Playing Game |
| JSM | Junior Spurs Members |
| KCF | Korat Cat Fancier |
| KCFA | Korat Cat Fanciers Association |
| KFC | Karwei Fan Club |
| KGB | Knights of Glory and Beer |
| KGB | Kolpings Glorie Blijft Soccer club, The Netherlands |
| KHII | Kingdom Hearts II |
| KIPPERS | Kids Infringing on Parental Privacy and Eroding Retirement Savings |
| KISS | Keep It Simple Squire |
| KKK | Korner Kar Klub |
| KLPD | Kross Language Pun Design |
| KMFC | Kuringai Model Flying Club |