Grant High School may refer to the following schools:

Australia Grant High School (Mount Gambier), South Australia

United States Grant Community High School in Fox Lake, Illinois Grant County High School in Dry Ridge, Kentucky Grant High School (Louisiana), part of the Grant Parish School Board in Louisiana Grant High School (Los Angeles), in Valley Glen Grant High School (Portland, Oregon) Grant Union High School (John Day, Oregon) Grant Union High School (Sacramento, California) U. S. Grant High School (Oklahoma), in Oklahoma City