HCL may refer to:

Science and medicine Hairy cell leukemia, an uncommon and slowly progressing B cell leukemia Harvard Cyclotron Laboratory, from 1961 to 2002, a proton accelerator used for research and development Hollow-cathode lamp, a spectral line source used in physics and chemistry Hydrochloric acid, a solution of hydrogen chloride in water Hydrochloride, the salt of hydrochloric acid and an organic base Hydrogen chloride, chemical formula HCl Hypomania Checklist, a questionnaire used to screen for hypomania and bipolar spectrum disorders HCL color space, a color space model designed to accord with human perception of color

Computing Hardware compatibility list HashiCorp Configuration Language, a configuration language authored by HashiCorp, used by cloud infrastructure automation tools, such as Terraform.

Organizations HCLTech, an IT outsourcing firm based in Noida, India HCL Axon, a subsidiary of HCL Technologies Hennepin County Library Hindustan Cables Limited, an Indian cable manufacturer Harvard College Library HC Lugano, a Swiss professional ice hockey team based in Lugano Honolulu Control Facility, an air traffic control facility Horizon Coach Lines, an American bus company HC Leipzig, German handball club

See also HCI (disambiguation)