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

Science

* British NVC community H6, an ecological designation * Sanguiin H-6, a dimeric ellagitannin found in ''Sanguisorba officinalis'', the great burnet * Hydrogen-6 (H-6 or ⁶H), an isotope of hydrogen

Transportation

Aircraft

* Hughes OH-6 Cayuse, a 1963 American scout helicopter ** MD Helicopters MH-6 Little Bird, a special forces variant *

Xi'an H-6 The Xi'an H-6 ( zh, c=轰-6, p=Hōng-6) is a twin-engine jet bomber of the Chinese People's Liberation Army Air Force (PLAAF). The H-6 is a license-built version of the Soviet Tupolev Tu-16 and remains the primary bomber aircraft of the People ...

, a Chinese bomber * Besson H-6, a French flying boat * Sikorsky R-6, a 1943 American helicopter

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

* PRR H6, a steam locomotive * Haval H6, a compact crossover SUV produced by Great Wall Motor *

Hispano-Suiza H6 The Hispano-Suiza H6 is a luxury car that was produced by Hispano-Suiza, mostly in France. Introduced at the 1919 Paris Motor Show,Ultimatecarpage.com – Hispano Suiza H6C Monza the H6 was produced until 1933. Roughly 2,350 H6, H6B, and H6C cars ...

, an automobile

Roads

* H6 Childs Way, a road in England * Highway H06, a road in Ukraine

Other uses

* , level 6 heading markup for HTML Web pages, see HTML element#heading *

Flat-six engine A flat-six engine, also known as a horizontally opposed-six, is a six-cylinder piston engine with three cylinders on each side of a central crankshaft. The most common type of flat-six engine is the boxer-six engine, where each pair of opposed c ...

, sometimes marketed as H6 * '' Halloween: The Curse of Michael Myers'', the sixth film in the ''Halloween'' franchise * '' H6: Diary of a Serial Killer'', a movie *

Composition H6 __NOTOC__ Composition H-6 is a melt-cast military aluminized high explosive. H-6 was developed in the United States. The chemical composition of H-6 is specified as follows: * 45.1 ± 0.3% RDX ; * 29.2 ± 3.0% TNT; * 21.0 ± 3.0% powdered alum ...

, an explosive * H6, a watch possibly made by

John Harrison John Harrison ( – 24 March 1776) was an English carpenter and clockmaker who invented the marine chronometer, a long-sought-after device for solving the History of longitude, problem of how to calculate longitude while at sea. Harrison's sol ...

* H6, the name given by the British Home Office to a Chinese businessman and alleged spy Yang Tengbo