| Acronym | Definition |
|---|
| HMCS➣Her Majesty's Courts Service (UK) |
| HMCS➣Her Majesty's Canadian Ship (Canada) |
| HMCS➣Hawaiian Mission Children's Society (est. 1852) |
| HMCS➣Harmonised Mandatory Control System |
| HMCS➣Her/His Majesty's Canadian Ship |
| HMCS➣Senior Chief Hospital Corpsman (Naval Rating) |
| HMCS➣Huygens Monitor and Control System (US NASA) |
| HMCS➣High Maltose Corn Syrup |
| HMCS➣Hydrometrocolpos, Postaxial Polydactyly, and Congenital Heart Malformation |
| HMCS➣Helmet Mounting Cueing System |
| HMCS➣Her Majesty's Colonial Ship |
| HMCS➣His/Her Majesty's Civil Service |