V21

V21 may refer to:


 * Autovía V-21, a road in Spain
 * Fokker V.21, a German prototype fighter aircraft
 * ITU-T V.21, a modem standard
 * Tamsui metro station, in New Taipei, Taiwan
 * Venture 21, an American sailboat
 * V21, constitutional states in development, in the ICD-9 V codes