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