D21

D21, D.XXI, D.21 or D-21 may refer to:

• D21 Navara, a Nissan car
• Arriflex D-21, a film-style digital motion picture camera
• Dewoitine D.21, a 1925 French open-cockpit, fixed-undercarriage monoplane fighter aircraft
• Fokker D.XXI, a 1935 Dutch fighter aircraft
• HMS Shah (D21), a 1943 British Royal Navy escort aircraft carrier
• Lockheed D-21/M-21, a 1962 American Mach 3+ reconnaissance drone
• Allis-Chalmers D Series
• D21 road (Croatia), a state road

and also :

• D21 Zulia, a Venezuelan Navy Nueva Esparta class destroyer
• Chondroma ICD-10 code
• DataSAAB D21, a computer from DataSAAB
• a D-21 Special, a guitar made by Martin Guitar

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