FMOS
| 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) |