H3, H03 or H-3 may refer to:
Entertainment
H3 (film), a 2001 film about the 1981 Irish hunger strike H3 – Halloween Horror Hostel, a 2008 German horror-parody television film Happy Hustle High, a manga series by Rie Takada, originally titled "H3 School!" h3h3Productions, styled "[h3]", a satirical YouTube channel
Science
Triatomic hydrogen (H3), an unstable molecule Trihydrogen cation (), one of the most abundant ions in the universe Tritium (3H), or hydrogen-3, an isotope of hydrogen ATC code H03 Thyroid therapy, a subgroup of the Anatomical Therapeutic Chemical Classification System British NVC community H3, a heath community of the British National Vegetation Classification system Histamine H3 receptor, a human gene Histone H3, a component of DNA higher structure in eukaryotic cells Hekla 3 eruption, a huge volcanic eruption around 1000 BC
Computing
HTTP/3, the third major version of the Hypertext Transfer Protocol Socket H3, a CPU socket , the level-3 HTML heading markup element H3, a geospatial indexing system based on a discrete global grid, developed by Uber
Transportation
Air and space H3 (rocket), a Japanese expendable launch system H-3 Air Base, a former Iraqi Air Force base in western Iraq Dynali H3 EasyFlyer, a Belgian helicopter Howland H-3 Pegasus, an American ultralight aircraft Sikorsky SH-3 Sea King, an American twin-engined anti-submarine warfare helicopter Standard H-3, an early American reconnaissance aircraft VFW-Fokker H3 Sprinter, a West German experimental rotorcraft
Automobiles Brilliance H3, a Chinese compact sedan Great Wall Haval H3, a Chinese compact SUV Huansu H3, a Chinese compact MPV Hummer H3, an American mid-size SUV IFA Horch H3, an East German lorry Rely H3, a Chinese light commercial van
Rail Alstom Prima H3, a French diesel/battery hybrid locomotive GNR Class H3, a class of British steam locomotives H3 series of METRORail tramways in Houston
Roads H3 Monks Way, part of the Milton Keynes grid road system, United Kingdom Interstate H-3, a highway in Hawaii
Ships H3 (yacht), a luxury yacht , a destroyer of the British Royal Navy , a submarine of the British Royal Navy , a submarine of the United States Navy
Other uses H3 (classification), a para-cycling classification H3 (Kuwait), an archaeological site H3 (pyrotechnics), a pyrotechnic composition , one of the three laryngeals in the reconstructed Proto-Indo-European language H3 Entertainment, a subsidiary of the film industry company The H Collective H3 Podcast, hosted by Ethan Klein Gerovital H3, a pseudoscientific anti-aging treatment Hash House Harriers, an international group of non-competitive running, social and drinking clubs H3, an 18th-century marine chronometer by John Harrison H3, a type of automotive halogen lamp H3 Hardy Collaboration Architecture, a firm started by Hugh Hardy DSC-H3, a 2008 Sony Cyber-shot camera
See also
3H (disambiguation) HHH (disambiguation) Triple H (disambiguation)