HLS may refer to: Organisations Harlington Locomotive Society, London, England HealthSouth, a former American hospital operator Huntingdon Life Sciences, a British contract research organisation HLS Ost (; ), German WWII cryptanalysis station Education Harvard Law School, Cambridge, Massachusetts, US Helen Lowry Higher Secondary School, Mizoram, India Highlands Latin School, Louisville, Kentucky, US Events Himalayan Languages Symposium, an annual academic conference on Trans-Himalayan languages Technology HTTP Live Streaming, a media streaming communications protocol HLS color space, a representation of points in an RGB color model High-level synthesis, an automated design process Transportation Human Landing System, a NASA program to choose a Moon landing system for the 2020s Starship Human Landing System, a modified version of the SpaceX Starship Heavy Logistics System, a USAF program to develop the Lockheed C-5 Galaxy Lockheed C-5 Galaxy, the winner of the USAF HLS project Haiti Air Freight (ICAO airline code HLS); see List of defunct airlines of Haiti St Helens Airport (IATA airport code HLS), Tasmania, Australia Hilsea railway station (station code HLS), England, UK Other uses Historical Dictionary of Switzerland (German: Historisches Lexikon der Schweiz) See also Health and life sciences; see health sciences and life sciences HL (disambiguation) HIS (disambiguation)