H18

H18 may refer to :

• Pushpalal Highway or Mid-hill Highway , a highway in mid-hilly region of Nepal
• 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