| Acronym | Definition |
|---|
| FMOS➣Factory Mars Operating System |
| FMOS➣Full Moon O Sagashite (anime) |
| FMOS➣First Marshal on Scene (motorsports safety training; UK) |
| FMOS➣Fibre-Fed Multi-Object Spectrograph |
| FMOS➣Formatted Message Origination System |
| FMOS➣Friends of Moraga Open Space (Lamorinda, CA) |