9H or 9-H can refer to:
9H, IATA code for Dutch Antilles Express 9H, see London Buses route 9 (Heritage) New York State Route 9H N-9H, a model of Curtiss Model N WAG-9H, a model of Indian locomotive class WAG-9 9H, National aircraft registration prefix for Malta The highest pencil hardness grade
See also H9 (disambiguation)