| EG | Japan Asia Airways [IATA-Airline-Code/ Japan] |
| NU | Japan Transocean Air [IATA-Airline-Code/ Japan] |
| JD | Japan Air System [IATA-Airline-Code/ Japan] |
| 3X | Japan Air Commuter [IATA-Airline-Code/ Japan] |
| JL | Japan Airlines [IATA-Airline-Code/ Japan] |
| NQ | Air Japan [IATA-Airline-Code/ Japan] |
| J | Japan - Länderkürzel |
| JAL | Japan Airline |
| JMA | Japan Meteorological Agency |
| JP | Japan, Länderkennung bei Internetadressen |
| IIJ | Internet Initiative Japan |
| JPN | Japan - Olympische Länderkennung |
| JST | Japan Standard Time |
| JIS | Japan Industrial Standards |
| JVC | Victor Company of Japan Friedberg, http://jdl.jvc-europe.com |
| BOJ | Bank of Japan [engl.] |
| POSI | Promotion Conference for OSI, Japan |
| XM | J-Air [IATA-Airline-Code / Japan] |
| JUNET | Japan/Japanese UNIX Network |
| JESA | Japan Engineering Standard Association |
| EIAJ | Electronics Industry Association of Japan |
| JECC | Japan Electronic Computer Company |
| Bull. Biogeogr. Soc. Jpn. | Bulletin of the Biogeographical Society of Japan Zeitschrift |
| NV | Nakanihon [IATA-Airline-Code/ Japan] |
| K.K. | Kabushiki Kaisha/ Gaisha [????, Aktiengesellschaft, Japan] |
| JH | Harlequin Air [IATA-Airline-Code/ Japan] |
| EL | Air Nippon [IATA-Airline-Code/ Japan] |
| FW | FAIR [IATA-Airline-Code/ Japan] |
| JASO | Japan Automobile Standards Organisation [engl.] |
| JO | JALways [IATA-Airline-Code/ Japan] |
| JC | JAL Express [IATA-Airline-Code/ Japan] |
| JICST | Japan Information Center of Science and Technology |
| EH | Air Nippon Network [IATA-Airline-Code/ Japan] |
| 1J | Axess international [IATA-Airline-Code/ Japan] |
| NH | All Nippon Airways [IATA-Airline-Code/ Japan] |
| BC | Skymark Airlines [IATA-Airline-Code/ Japan] |
| HD | Hokkaido International Airlines [IATA-Airline-Code/ Japan] |
| KZ | Nippon Cargo Airlines [IATA-Airline-Code/ Japan] |
| 1F | INFINI Travel Information [IATA-Airline-Code/ Japan] |