H19

H19 or H-19 may refer to:
 * H19 (gene), a maternally-transmitted human gene
 * British NVC community H19, a type of heath community in the British National Vegetation Classification
 * Heathkit H19, a serial terminal used with the Heathkit H8 microcomputer
 * Highway H19 (Ukraine)
 * HMS H19, an H-class submarine ordered by but not commissioned into the Royal Navy
 * HMS Harvester (H19), a Royal Navy H-class destroyer
 * London Buses route H19, a public transportation route in London, England
 * Sikorsky H-19, an American helicopter