9D

9D or 9-D can refer to:

• IATA code for Toumaï Air Tchad
• New York State Route 9D
• Kepler-9d, an extrasolar planet orbiting the star Kepler-9
• SSH 9D, alternate designation for Washington State Route 108
• Navy AIM-9D/G/H, designation for the AIM-9 Sidewinder
• Orion 9D, a model of Lockheed Model 9 Orion aircraft
• Yak-9D, a model of Soviet Yakovlev Yak-9
• GCR Class 9D, a class of British 0-6-0 steam locomotive