MRJ Views 6 meanings found MRJ can denote community groups such as Men of Reform Judaism, a Java runtime environment for Macintosh, a mining company, or geographic references like Marcala in Honduras, reflecting its broad cross‑sector use. Miscellaneous Mitsubishi Regional Jet Community Men of Reform Judaism Governmental Midship Runabout Joyful Regional Marcala, Honduras Computing Macintosh Runtime For Java Business Meridien Resources Limited