H11, H-11 or H 11 may refer to: H-11 (Michigan county highway) British NVC community H11, a type of heath community in the British National Vegetation Classification Heathkit H-11, a microcomputer , a Royal Navy B-class destroyer , a Royal Navy R-class destroyer , a Royal Navy H-class submarine London Buses route H11, a Transport for London contracted bus route Sanguiin H 11, a type of tannin A motor vehicle headlamp bulb type; see List of automotive light bulb types