H6, H06, or H-6 may refer to:

In transportation [link]

in aircraft:

• Hughes OH-6 Cayuse, a 1963 American scout helicopter
  • MD Helicopters MH-6 Little Bird, a special forces variant
• Xian H-6, a Chinese bomber
• Besson H-6, a French flying boat
• Sikorsky R-6, an 1943 American helicopter

in watercraft:

• HMS H6, a British submarine
• USS H-6 (SS-149), a United States submarine
• HMS Hurricane (H06), a British Havant class destroyer
• HMS Keith (H06), a British B-class destroyer

Other vehicles [link]

• PRR H6, a steam locomotive
• Hispano-Suiza H6, an automobile

Roads [link]

• H6 Childs Way, a road in England
• Highway H06 (Ukraine), a road in the Ukraine

In biology / medicine [link]

• British NVC community H6, an ecological designation
• Sanguiin H-6, a dimeric ellagitannin found in Sanguisorba officinalis, the great burnet
• an eye disease in ICD-10 code

In other uses [link]

• a straight-six engine, sometimes marketed as H6
• H6: Diary of a Serial Killer, a movie
• Composition H6, an explosive
• a watch possibly made by John Harrison

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