| Exercise Mainbrace | |
|---|---|
| Part of Cold War (1947–1953) | |
 NATO Northern Flank | |
| Type | NATO combined naval training exercises |
| Location | |
| Planned by | SACLANT & SACEUR |
| Objective | Deployment of NATO anti-submarine warfare forces, aircraft carrier strike forces, and supply convoys |
| Date | September 14–25, 1952 |
| Executed by | Admiral Sir Patrick Brind, RN (CINCNORTH) |
| Outcome | Exercise successfully executed |
Exercise Mainbrace was the first large-scale naval exercise undertaken by the newly established Allied Command Atlantic (ACLANT), one of the two principal military commands of the North Atlantic Treaty Organization (NATO). It was part of a series of NATO exercises jointly commanded by Supreme Allied Commander Atlantic Admiral Lynde D. McCormick, USN, and Supreme Allied Commander Europe General Matthew B. Ridgeway, U.S. Army, during the fall of 1952.