RDM

The abbreviation RDM may refer to:

* Radar Doppler Multifunction, a stopgap radar for the Mirage 2000 French fighter, also known as the Cyrano 5, an evolution of the Cyrano 4 used on the older Mirage F-1
* Random Data Modeling, the ability to model randomized data points
* Red Mage, a character class from Dungeons and Dragons and Final Fantasy
* Reliably Delivered Messages, Microsoft's implementation of the Pragmatic General Multicast protocol
* Results Data Model, for RMS software RiskLink
* RDM (lighting), an electronic protocol used in stage lighting
* Riding Mill railway station, England; National Rail station code RDM
* Ronald D. Moore, the creator of the new Battlestar Galactica series (sometimes dubbed Battlestar Galactica (RDM)), as well as an important member of the Deep Space Nine (Star Trek) writing staff
* Roberts Field Airport, an airport that serves the cities of Redmond and [Bend in Oregon
* Rovescio della Medaglia, an Italian symphonic rock band
* ICAO airport code for Roberts Field Airport
* Reduced density matrix, in the Contracted Schrödinger Equation method for finding the electronic structure of molecules
* Reusable Device Module
* Rotterdamsche Droogdok Maatschappij, a shipbuilding and repair company in Rotterdam in the Netherlands
* Reduced Diameter Mast, a windsurfing sail mast with smaller diameter compared to regular masts
* Roberto Di Matteo, ex-Italian football international and current Milton Keynes Dons FC manager