4H (disambiguation)

4H may refer to:

4-H, a youth organization administered by the USDA Curtiss JN-4H, an American biplane 4H, a Washington, D.C. Metrobus route, in the United States 4H-pyran 4H-SiC, one of the polymorphs of silicon carbide Hydrogen-4 (4H, or quadrium), an isotope of hydrogen 4H, IATA code for United Airways, a Bangladeshi airline 4H disease, an early name for AIDS since the syndrome seemed to affect heroin users, homosexuals, hemophiliacs, and Haitians 4H, the production code for the 1975 Doctor Who serial Planet of Evil

See also H4 (disambiguation)