The following schools are abbreviated GHS:
- Gabrielino High School - San Gabriel, California, USA
- Gaffney High School - Gaffney, South Carolina, USA
- Gainesville High School (disambiguation)
- Gaithersburg High School - Gaithersburg, Maryland, USA
- Galt High School - Galt, California, USA
- Garfield High School (disambiguation)
- Garland High School - Garland, Texas, USA
- Garvagh High School - County Londonderry, Northern Ireland
- Gateway High School (disambiguation)
- Geelong High School, a secondary school in Geelong, Australia.
- George Heriot's School - Edinburgh, Scotland
- Germantown High School (disambiguation)
- Girls' High School and College - Allahabad, Uttar Pradesh, India
- Gladstone High School (disambiguation)
- Glassboro High School - Glassboro, New Jersey, USA
- Glastonbury High School - Glastonbury, Connecticut, USA
- Glendale High School (disambiguation)
- Glendora High School - Glendora, California, USA
- Glenwood High School (disambiguation)
- Mills E. Godwin High School - Henrico County, Virginia, USA
- Gokuldham High School - Mumbai, India
- Golden High School - Golden, Colorado, USA
- Gonzaga High School - St. John's, Newfoundland and Labrador, Canada
- Good Hope School - Kowloon, Hong Kong
- Gorham High School (disambiguation)
- Gorokan High School - Gorokan, New South Wales, Australia
- Gosford High School - Gosford, New South Wales, Australia
- Gosforth High School - Newcastle upon Tyne, England
- Goshen High School (disambiguation)
- Grace High School - Grace, Idaho, USA
- Henry W. Grady High School - Atlanta, Georgia, USA
- Granby High School - Norfolk, Virginia, USA
- Grants High School - Grants, New Mexico, USA
- Grapevine High School - Grapevine, Texas, USA
- Greenbrier High School - Evans, Georgia, USA
- Greendale High School - Greendale, Wisconsin, USA
- Greenfaulds High School - Greenfaulds, Cumbernauld, UK
- Greenfield High School (California) - Greenfield, California
- Greenfield High School (Illinois) - Greenfield, Illinois
- Greenfield High School (Massachusetts) - Greenfield, Massachusetts
- Greenfield High School (Missouri) - Greenfield, Missouri
- Greenfield High School (Tennessee) - Greenfield, Tennessee
- Greenfield High School (Wisconsin) - Greenfield, Wisconsin
- Greenwich High School - Greenwich, Connecticut, USA
- Guilderland High School - in New York, USA
- Guam High School - Agana Heights, Guam
- Gulf High School - New Port Richey, Florida, USA
- Glenrothes High School - Glenrothes, Fife, Scotland
- Greenway High School - Phoenix AZ
- Gawler High School - Gawler, South Australia, Australia
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