| Acronym | Definition |
|---|
| MCJ | Milwaukee Community Journal (Milwaukee, WI) |
| MCJ | Menominee County Journal (Stephenson, MI) |
| MCJ | Mass Communication and Journalism (various universities) |
| MCJ | Mississippi Center for Justice |
| MCJ | Mayo Clinic Jacksonville (Florida) |
| MCJ | Malattia Di Creutzfeldt-Jakob (Italian: Creutzfeldt-Jakob Disease) |
| MCJ | Midwest Conservative Journal |
| MCJ | Motard Club Jouettois (French biker club) |
| MCJ | Master Criminal Justice |
| MCJ | Mortgage Corporation of Japan, Ltd. |
| MCJ | Microcrystalline Cellulose, Jet Milled |
| MCJ | Master of Laws in Comparative Jurisprudence Degree |
| MCJ | Masonry Control Joint (wall reinforcement) |