9H

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