CPJ is used as an abbreviation for:
- Center for Public Justice, an independent organization for policy research and civic education based in Washington, D.C.
- Citizens for Public Justice is a nonprofit organization based in Canada.
- The Cleft Palate-Craniofacial Journal, a medical journal and the official publication of the American Cleft Palate-Craniofacial Association.
- Committee to Protect Journalists, an independent nonprofit organization based in New York, United States.
- Communist Party of Jersey, a political party on the island of Jersey.
- CPJ is the ICAO airline designator for Corpjet, United States.
- Cabbage Patch Jesus, an independent online music radio station, based in St. Louis, Missouri.