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423 Maritime Helicopter Squadron (French: 423e Escadron d'hélicoptères maritimes) is a unit of the Canadian Forces under Royal Canadian Air Force. It currently operates the Sikorsky CH-124 Sea King from CFB Shearwater in Nova Scotia, Canada.
No. 423 Squadron RCAF was a World War II unit of the Royal Canadian Air Force. Formed in 1942 in Oban, Argyll, Scotland it was disbanded in 1945. It flew Short Sunderland flying boats, performing anti-submarine and convoy escort patrols. Reformed in 1953 at RCAF Station St Hubert (now Montréal/Saint-Hubert Airport) flying the CF-100, it was again disbanded in 1962. In 1974, it was reformed a final time and in 1994 given its present name.