21st Reconnaissance Squadron (disambiguation)

21st Reconnaissance Squadron may refer to:


 * The 911th Air Refueling Squadron, designated the 21st Reconnaissance Squadron (Long Range) from December 1939 to November 1940 and the 21st Reconnaissance Squadron (Heavy) from November 1940 to April 1942.
 * The 21st Expeditionary Reconnaissance Squadron, designated the 21st Reconnaissance Squadron (Bomber) from April 1943 to August 1943.
 * The 921st Air Refueling Squadron, designated the 21st Reconnaissance Squadron, Photographic from October 1947 to June 1949.