HCA may refer to: Courts High Court of Australia, the supreme court in the Australian court hierarchy and the final court of appeal in Australia Organizations Europe Hall–Carpenter Archives, an archive of materials related to gay activism in Britain Heidelberg Center for American Studies, an institute at Heidelberg University, Germany Helsinki Citizens' Assembly, a nongovernmental organization dedicated to peace, democracy and human rights in Europe Heritage Crafts Association, a UK charity that helps to preserve traditional hand crafts Homes and Communities Agency, a UK non-departmental public body United States Heritage Christian Academy (disambiguation), several private Christian schools: Heritage Christian Academy (Fort Collins, Colorado) Heritage Christian Academy (Texas) Heritage Christian Academy (Kansas) Heritage Christian Academy (Minnesota) Heritage Christian Academy (New Jersey) Hopkins Consulting Agency, a student-run technology consulting company at The Johns Hopkins University Hospital Corporation of America, an operator of health care facilities Other organizations Hillcrest Christian Academy, an independent primary school in South Africa Holy Child Academy, a Catholic school in Pagadian City, Philippines Science and technology Heterocyclic amine, a type of chemical compound containing at least one heterocyclic ring Hexachloroacetone, an organic compound also called hexachloropropanone or perchloroacetone Hierarchical cluster analysis, a method of cluster analysis used in data mining High content analysis, a laboratory microscopic technique Host channel adapter, in electronic communications Hydroxycitric acid Holloway Cut Advisor, a method of rating brilliant cut diamonds Hot Cranking Amps, a measurement of the current provided by a car battery Hydrographic Commission on Antarctica Other uses HCA (classification), a para-cycling classification HC Andersen (band), Finnish rock band Healthcare Assistant, a UK name for a job class of medical paraprofessionals Hennepin Center for the Arts, a building in Minneapolis, Minnesota, US Historical cost accounting