| Acronym | Definition |
|---|
| m3 | Cubic Meter(s) |
| m3 | Mother 3 (gaming) |
| m3 | Major Third (musical) |
| m3 | Modula-3 |
| m3 | Minor Third (musical) |
| m3 | Westjet (airline code) |
| m3 | Metal Machine Music (gaming) |
| m3 | Third-Year Medical Student |
| m3 | Multi Media Marketing |
| m3 | Multimedia Message Manager (automated message processing services) |
| m3 | Marvelous Three (band) |
| m3 | Mega Man Mush (anime/game) |
| m3 | Mondo3 (website) |
| m3 | Maintenance & Materiel Management |
| m3 | Military Manpower Model |
| m3 | [not an acronym] economic indicator showing changes in manufacturing (manufacturers' shipments, inventories, and orders) |