H5

H5, H05 or H-5 may refer to:

Science

 * Influenza A virus subtype H5 (disambiguation), all A type viruses containing H5 type of agglutinin
 * Histone H5, a histone similar to Histone H1
 * Haplogroup H5 (mtDNA), a genetics subgroup
 * ATC code H05 Calcium homeostasis, a subgroup of the Anatomical Therapeutic Chemical Classification System
 * British NVC community H5
 * Hydrogen-5 (H-5), an isotope of hydrogen
 * H05, an ICD-10 code for diseases of the eye and adnexa

Technology

 * H5 (chronometer), a 1773 marine chronometer designed by John Harrison
 * DSC-H5, a full-featured-camera made by Sony
 * H5, a hurricane tie manufactured by Simpson Strong-Tie Co
 * .h5, filename extension used in Hierarchical Data Format
 * , level 5 heading markup for HTML web pages

Transportation

 * H5 Series Shinkansen, a Japanese Shinkansen high-speed train
 * H5 Portway, a road part of the Milton Keynes grid road system, England
 * Hola Airlines (IATA code: H5), a former Spanish airline
 * Magadan Airlines (IATA code: H5), a former Russian airline

Military

 * HMS H5, a 1918 British Royal Navy H-class submarine
 * HMS Greyhound (H05), a 1935 British Royal Navy G-class destroyer
 * HMS Ithuriel (H05), a 1940 British Royal Navy I-class destroyer
 * H-5, a Chinese manufactured variant of the Soviet Ilyushin Il-28 jet bomber
 * Sikorsky H-5, a helicopter
 * USS H-5 (SS-148), a 1918 United States Navy submarine

Other uses

 * H5 (US company), an American electronic discovery company headquartered in San Francisco, California
 * H5 (French company), a French video company
 * H5 (classification), a para-cycling classification