CSJ or C.S.J. may refer to:
- Campaign for Social Justice, a group which began campaigning for civil rights in Northern Ireland in 1964
- Centre for Social Justice
- Chemical Society of Japan
- Congregation of the Sisters of Saint Joseph
- Cultic Studies Journal predecessor to the Cultic Studies Review
- ICAO airline designator for Castle Aviation
- Jung Chan-Sung, a South Korean mixed martial artist
- Superior Council of the Judiciary of Colombia
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