| 40 Commando Royal Marines | |
|---|---|
 Unit badge | |
| Active | 1942–present |
| Country |  United Kingdom |
| Branch | |
| Type | Commando |
| Size | One battalion |
| Part of | 3 Commando Brigade |
| Garrison/HQ | Norton Manor Camp, Taunton, Somerset |
| Motto(s) | Per Mare Per Terram By Sea By Land (Latin) |
| March | Quick: "A Life on the Ocean Wave" Slow: "Preobrajensky" |
| Commanders | |
| Current commander | Lt Col Oliver Denning RM |
| Captain-General, Royal Marines | King Charles III |
| Regimental Sergeant Major | WO1 L Drinkwater RM |
40 Commando RM is a battalion-sized formation of the British Royal Marines and subordinate unit within 3 Commando Brigade, the principal Commando formation, under the Operational Command of Commander in Chief Fleet. Their barracks are at Norton Manor Camp, Norton Fitzwarren near Taunton in Somerset.
Tasked as a Commando light infantry unit, 40 Commando (pronounced "Fourty Commando") is capable of a wide range of operational tasks. Personnel regularly deploy outside the United Kingdom on operations or training. Whilst 3 Commando Brigade RM are the principal cold weather warfare formation, personnel are capable of operating in a variety of theatres including tropical jungle, desert or mountainous terrain. The Commando is a regular participant in the annual Brigade cold weather warfare exercise in Norway. The unit's first "winter" was 1991, until which the unit was nicknamed the "Sunshine Commando".
All personnel will have completed the Commando course at the Commando Training Centre (CTCRM) at Lympstone in Devon, entitling them to wear the green beret, with attached personnel having completed the All Arms Commando Course.