H18 may refer to :
- British NVC community H18, a heath in the British National Vegetation Classification system
- HMS H18, an H-class submarine ordered by but never commissioned into the Royal Navy
- HMS Sabre (H18), a Royal Navy S-class destroyer
- London Buses routes H18, a Transport for London contracted bus route
- Sikorsky H-18, an American helicopter
- Tomakomai Station, in Hokkaido, Japan
This disambiguation page lists articles associated with the same title formed as a letter–number combination.
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