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
 
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