HLS

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 (Horchleitstelle Ost; Intercept Control Station East), German WWII cryptanalysis station

Education

 * Harvard Law School, Cambridge, Massachusetts, US
 * Helen Lowry Higher Secondary School, Mizoram, India
 * Highlands Latin School, Louisville, Kentucky, US

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 HLS, 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 ); see List of defunct airlines of Haiti
 * St Helens Airport (IATA airport code ), Tasmania, Australia
 * Hilsea railway station (station code ), England, UK

Other uses

 * Historical Dictionary of Switzerland (German: Historisches Lexikon der Schweiz)
 * Holy See; also UNDP country code for Vatican City
 * Himalayan Languages Symposium, an annual academic conference on Trans-Himalayan languages