DDM may refer to: Computing Data Diffusion Machine, a virtual shared memory computer architecture from the 1990s Digital diagnostics monitoring function in SFP transceivers Distributed Data Management Architecture, an open, published architecture for creating, managing and accessing data on a remote computer. Dynamic Data Masking, a form of data masking Dynamic Device Mapping, an advanced technology for USB KVM switches Science and technology Derrick Drilling Machine, or Top drive Difference in the Depth of Modulation, an amplitude modulation method used in the Instrument Landing System Differential dynamic microscopy, an optical technique Direct Digital Manufacturing Doctor of Dental Medicine, an academic degree for dentistry Domain decomposition methods Drift Diffusion Model, a method used in psychological choice testing Maltosides (n-Dodecyl β-D-Maltopyranoside), a detergent used when purifying membrane proteins Dyson Digital Motor, a two-pole switched reluctance motor Finance Dividend Discount Model, a valuation method for shares based on dividends East German mark, a former currency (ISO code was DDM) Other uses Deutsches Dampflokomotiv-Museum, the German Steam Locomotive Museum Dharma Drum Mountain, a Buddhist educational foundation Didymoteicho, a Greek town Dubbeldeks Materieel, a class of trains in the Netherlands Dungeon Dice Monsters, a board game Dungeons & Dragons Miniatures Game, collectible tactical skirmish game