RDM
- Il Rovescio della Medaglia
- Lynn G. Gref
- RDM (lighting)
- RDMS (disambiguation)
- Radar Doppler Multifunction
- Radarman
- Raphael Maklouf
- Red Mage
- Reduced density matrix
- Republica Democratică Moldovenească
- Research data management
- Rheinmetall Denel Munition
- Rheinmetall Denel Munition South Africa
- Rhythms del Mundo
- Richardson Devine Marine
- Riding Mill railway station
- Robert Douglas McIntyre
- Robert Duncan McNeill
- Roberto Di Matteo
- Roberts Field
- Robust decision-making
- Ronald D. Moore
- Rotterdamsche Droogdok Maatschappij
- Roy D. Mercer