HGS may refer to HGS (gene), a human gene HGS (electronic toll collection), used in highways and bridges in Turkey Hampstead Garden Suburb, Greater London, England Hastings Airport (Sierra Leone) Hastings railway station, a railway station in Sussex, England Head Gear System, a combat helmet Head-up Guidance System, a transparent display that allows pilots to view aircraft flight data without needing to look down at the instrument panel. Hervormd Gereformeerde Staatspartij, a Dutch political party Human Genome Sciences, an American pharmaceutical company HydroGeoSphere, hydrology modelling software Mercury sulfide (HgS) Halifax Grammar School, in Nova Scotia, Canada Handsworth Grammar School, in Birmingham, England The Harvey Grammar School, in Folkestone, Kent, England Heckmondwike Grammar School, in West Yorkshire, England