PACS is an acronym with several meanings:
Medicine Post-acute COVID-19 syndrome; see Long COVID Partial anterior circulation stroke syndrome, the symptoms of a type of an ischemic stroke Picture archiving and communication system, in medical imaging Premature atrial contractions (plural)
Organizations and establishments Pacte civil de solidarité, a form of civil union in France Palo Alto Chinese School, Palo Alto, California, USA Political action committees, groups organized to elect or defeat political candidates (plural) Poorest Areas Civil Society Program (2001–2008), a defunct Indian social welfare program Primary Agricultural Credit Society, co-operative credit institutions in India Provisional Army of the Confederate States, of the Confederate States Army (American Civil War)
Physics and astronomy Physics and Astronomy Classification Scheme, developed by the American Institute of Physics Photodetecting Array Camera and Spectrometer, an instrument of the Herschel Space Observatory
Other Primary airport control station, a survey marker established in the vicinity of an airport Personal access control system. Gates, barriers and turnstiles that provide security for restricted areas on buildings and sites. Cape Sarichef Airport (ICAO airport code), on Unimak Island of the Aleutian Islands, Alaska Peace and conflict studies, an academic field that identifies and analyzes violent and nonviolent behaviors of social conflicts
See also PAC (disambiguation)