409 Tactical Fighter Squadron (French: 409e Escadron d'appui tactique) is a unit of the Royal Canadian Air Force.

Two victories were claimed during the early days of the squadron's existence, but in June 1942 Beaufighter Mark VI aircraft were received, and a greater degree of success was achieved.

[4] After some action against V-1 Flying Bombs, operations over Europe recommenced, and late in August the unit moved to Carpiquet in France, the first night fighters to be based on the mainland.

[4] Re-established at RCAF Station Comox on 1 November 1954 providing air defence for Canada's west coast as part of NORAD.

[5] The NATO enhanced Air Policing mission in the region is an assurance and deterrence measure taken in 2014 as a response to Russia's annexation of Crimea.