HSL may refer to:

Science, technology and computing

  • HSL (Fortran library), a numerical software library
  • HSL and HSV color space
  • Health and Safety Laboratory, UK
  • Hormone-sensitive lipase, a protein
  • Hybrid solar lighting

Transport

  • Bell HSL, a 1950s U.S. Navy antisubmarine helicopter
  • Haslemere railway station in England
  • Helsinki Regional Transport Authority (), in Finland
  • High-speed launch, a type of military boat typically used for air-sea rescue operations
  • Hindustan Shipyard, in Visakhapatnam, Andhra Pradesh, India
  • Hispania Líneas Aéreas, a defunct Spanish airline
  • HSL Logistik, a German train operator
  • Huslia Airport, in Alaska, US
  • High-speed rail lines in Benelux HSL 1, HSL 2 HSL 3 HSL 4, and HSL-Zuid
  • HSL-34 to HSL-94: Former US Navy helicopter Anti-submarine (Light) squadrons

Other uses

  • Hausa Sign Language, Kano, Nigeria
  • Hawaiʻi Sign Language, Hawaii, United States
  • Hamburg School of Logistics, now Kühne Logistics University, Germany
  • Staff Selection Commission Combined Higher Secondary Level Exam or CHSL/HSL, civil service examination by the Staff Selection Commission for governmental posts in India