No. 213 Squadron was a squadron of the Royal Air Force. The squadron was formed on 1 April 1918 from No. 13 (Naval) Squadron of the Royal Naval Air Service. This RNAS squadron was itself formed on 15 January 1918 from the Seaplane Defence Flight which, since its creation in June 1917, had had the task of defending the seaplanes which flew out of Dunkirk.