The abbreviation RDM may refer to:
Radar Doppler Multifunction, a stopgap radar for the Mirage 2000 French fighter,
Radarman, a former rank of the U.S. Navy,
Raw Disk Mapping, a hard disk's mapping for use by a virtual disk image,
Red Digital Magazines, (.RDM) - in reference to the "Red-One Camera",
Red Dragon Movement, a now defunct Welsh nationalist organization,
Red Mage, a character class from Dungeons & Dragons and Final Fantasy,
Reduced density matrix, in the Contracted Schrödinger Equation method for finding the electronic structure of molecules,
Reliably Delivered Messages, Microsoft's implementation of the Pragmatic General Multicast protocol,
Remote Device Management, an electronic protocol used in stage lighting,
Rhythms del Mundo, a nonprofit salsa and mambo album from an all-star cast of Cuban musicians,
Riding Mill railway station, England; National Rail station code RDM,
Roberto Di Matteo, ex-Italian football international,
Roberts Field Airport (IATA airport code), an airport that serves the cities of Redmond and Bend in Oregon,
Ronald Dowl Moore, the creator of the new Battlestar Galactica series (sometimes dubbed Battlestar Galactica (RDM)),
Rotterdamsche Droogdok Maatschappij, a shipbuilding and repair company in Rotterdam in the Netherlands,
Rovescio della Medaglia, an Italian symphonic rock band,
Roy D. Mercer, a prank-calling radio character,
RDM Server, a database platform from Raima Inc,
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