Operators
- Denmark
- Danish Army Air Corps received 2 aircraft and built 10 on license.
- Finland
- Finnish Air Force received 7 aircraft and built 93 on license.
- No. 10 Squadron, Finnish Air Force
- No. 12 Squadron, Finnish Air Force
- No. 14 Squadron, Finnish Air Force
- No. 24 Squadron, Finnish Air Force
- No. 26 Squadron, Finnish Air Force
- No. 30 Squadron, Finnish Air Force
- No. 32 Squadron, Finnish Air Force
- Germany
- Luftwaffe operated an unknown number of captured Dutch aircraft.
- Netherlands
- Dutch Army Aviation Group received 36 aircraft.
1 Luchtvaartregiment (1 aviation regiment) 1 and 2 Jachtvliegersafdeling (JaVa) (fighter squadron) 2 Luchtvaartregiment
- Spanish Republic
- Spanish Republican Air Force May have completed 1 aircraft.
Read more about this topic: Fokker D.XXI