PACI may refer to:
Chalkyitsik Airport (ICAO location indicator: PACI), in Chalkyitsik, Alaska, United States Pacific AC Intertie, see also Path 15 Partnering Against Corruption Initiative (PACI), a global anti-corruption and compliance platform organized by the World Economic Forum Partial anterior circulation infarct, a type of ischemic stroke Port Arthur Collegiate Institute, a former high school in Thunder Bay, Ontario, Canada