Hz is the International Standard symbol for hertz, a unit of frequency.
Hz. may also stand for:
Hazrat, an honorific Arabic and Turkish title used to honour a person, used especially for prophets, e.g. Hz. Muhammad, Hz. Ibrahim, etc.
HZ may also stand for: HZ (character encoding) Habitable zone, the distance from a star where a planet can maintain Earth-like life Hazard, a situation that poses a level of threat Haze, in meteorology, METAR code HZ Herero language (ISO 639 alpha-2) Herpes zoster, the shingles virus Holden HZ, an automobile produced by General Motors Holden in the late 1970s Hz-program, a typographic composition computer program created by Hermann Zapf. HZ University of Applied Sciences, a vocational university in Zeeland, Netherlands SAT Airlines (IATA airline designator) Saudi Arabia (aircraft registration code) HŽ, the acronym of Croatian Railways ()