Hyl or HYL may refer to: Helsingin yhteislyseo, a school in Kontula, Helsinki, Finland Hydroxylysine, an amino acid HYL, the IATA code for Hollis Seaplane Base, Alaska, US HYL, the National Rail code for Hayle railway station, Cornwall, UK Hyl (unit) or metric slug, a unit of mass Nils Hylander (1904–1970), Swedish botanist, author abbreviation See also