FMX
| Acronym | Definition |
|---|---|
| FMX | Fax Modem Switch |
| FMX | Freestyle Motorcross |
| FMX | FM Transmitter |
| FMX | First Meta Exchange (gaming currency) |
| FMX | Full Mouth X-rays (dental) |
| FMX | Fleet Message Exchange |
| FMX | Frequency Modulation Extended-Range (transmission system) |
| FMX | Fleet Management Expansion (program directed by the Vice Chief of Staff, Army) |