| Unit Name: | No. 21 Squadron |
| Country: |  New Zealand |
| Type: | Fighter bomber |
| Branch: | Royal New Zealand Air Force |
| Dates: | 1944–1945 |
| Battles: | World War II |
No. 21 Squadron was a squadron of the Royal New Zealand Air Force. Formed in May 1944, it was equipped with F4U-1 Corsair fighter bombers.
21 Squadron was deployed to Kukum Field on Guadalcanal from June–July 1944, to Piva Airfield on Bougainville from July–September 1944 and then returned to Guadalcanal from November–December 1944.[1] 21 Squadron deployed to Green Island from April–May 1945 and then to Jacquinot Bay from May–July 1945. The squadron was disbanded in September 1945.[1]