HMCS Margaret Brooke (AOPV 431) is the second Harry DeWolf-class offshore patrol vessel for the Royal Canadian Navy (RCN).

Named after Sub-Lieutenant Margaret Brooke, an RCN nursing sister who tried to save another person during the sinking of the ferry SS Caribou during World War II.

[8][2][9] Margaret Brooke is able to deploy with multiple payloads, including shipping containers, underwater survey equipment or landing craft.

[10] The order for the Arctic Offshore Patrol Ships was placed on 19 October 2011 with Irving Shipyards of Halifax, Nova Scotia, as part of the National Shipbuilding Procurement Strategy.

During World War II, Margaret Brooke, a navy nursing sister, was decorated for her actions during the sinking of the passenger ferry SS Caribou.

[18] The vessel, though not formally commissioned, was among the RCN ships deployed to the Arctic as part of the multinational military exercise Operation Nanook in August 2022.

The vessel provided assistance including damage assessment and welfare checks to the most impacted communities along the south coast of Newfoundland, where water access was the only means of entering the area.

[22] In June, the ship was deployed to Havana Harbour where Russian vessels, including the submarine Kazan and the frigate Admiral Gorshkov, were also present.