| 21st Airship Group | |
|---|---|
 A 1922 photo of the C-2 blimp at Brooks Field, Texas | |
| Active | 16 October 1917 – December 1918 13 September 1921 – 1 June 1939 |
| Disbanded | 27 May 1939 |
| Country |  United States |
| Branch | Air Corps |
| Type | Group |
| Motto(s) | Sic Itur ad Astra (Thus even to the Stars) |
| Engagements | World War I |
| Insignia | |
| 21st Airship Group distinctive unit insigne (emblem approved 25 June 1924) | 21st Airship Group - Emblem.png |
The 21st Airship Group was a unit of the United States Army Air Corps. It was last assigned to the 3d Wing at Scott Field, Illinois. It was originally activated under a different name in 1921, and disbanded on 27 May 1939.
A predecessor of the group served on the Western Front in France during World War I. For most of the period between the two World Wars, the group was the only active lighter-than-air headquarters in the United States Army Air Service and, later, the United States Army Air Corps.