IEH may refer to:
Institute of Experimental History, a fictional organization in the Noon Universe fictional setting IEH, a signature used by Johan Engholm International Environment House, base of the Geneva Environment Network Secretariat International Extreme Ultraviolet Hitchhiker payloads carried in the payload bay of STS-69 and later space shuttle missions Common prefix for system utility programs in IEFBR14 Institute of Electric Energy Systems and High-Voltage Technology at the Karlsruhe Institute of Technology