6D

6D, 6d, or 6-D may refer to:


 * Canon EOS 6D, a digital SLR camera
 * Jamaica 6d abolition of slavery postage stamp, a 1921 stamp issue
 * Six-dimensional space, any space that has six dimensions
 * 6D, the production code for the 1983 Doctor Who serial Snakedance
 * Sixpence (British coin), often shortened to "6d."

Aircraft

 * Boeing Model 6D, an American biplane flying-boat
 * B-6D, a model of Xian H-6
 * Grumman KA-6D, a model of Grumman A-6 Intruder
 * F-6D Mustang, a model of North American P-51 Mustang
 * North American AT-6D Texan, a model of North American T-6 Texan
 * OH-6D, a model of Hughes OH-6 Cayuse
 * XP-6D, a model of Curtiss P-6 Hawk