The history of the Royal Canadian Navy goes back to 1910, when the naval force was created as the Naval Service of Canada and renamed a year later by King George V. The Royal Canadian Navy (RCN) is one of the three environmental commands of the Canadian Forces. Over the course of its history, the RCN has played a role in the First World War, contributed significantly to the Battle of the Atlantic during the Second World War, and was a part of NATO's force buildup during the Cold War. In 1968, the RCN was amalgamated with the Canadian Army and the Royal Canadian Air Force to form what is today the unified Canadian Armed Forces. The naval force was known as Maritime Command until 2011, when the environmental command was renamed as the Royal Canadian Navy.

The Naval Service Act was a statute of the Parliament of Canada, enacted in 1910. The Act was put forward by the Liberal government of Prime Minister Sir Wilfrid Laurier to establish a Canadian navy. Prior to the passage of the Act, Canada did not have a navy of its own, being dependent on the British Royal Navy for maritime defence. The Act intended to provide Canada with a separate naval force, but one that, if needed, could be placed under British control during a time of war. French-Canadian nationalists and British-Canadian imperialists both opposed the Act, although for different reasons. The controversy of the naval question eventually contributed to the defeat of Laurier's government in the federal election of 1911. The new Conservative government, led by Prime Minister Sir Robert Borden, instead proposed building three battleships or cruisers, to be put at the service of the British Navy.