| JALOS | Japanese Lubricating Oil society |
| JAMA | Japanese Automobile Manufacturers Association |
| JARI | Japanese Automotive Research Institute |
| JASO | Japanese Automotive Standards Organization |
| JCAP | Japan Clean Air Program |
| JD | John Deere |
| JIS | Japanese Industrial Standards |
| JPI | Japanese Petroleum Institute |
| JSAE | Japanese Society of Automotive Engineers |
