V21
V21 may refer to:
- Autovía V-21, a road in Spain
- Fokker V.21, a German prototype fighter aircraft
- ITU V.21, an ITU-T V-series recommendation
- Tamsui metro station, in New Taipei, Taiwan
- Venture 21, an American sailboat
- V21, constitutional states in development, in the ICD-9 V codes