IDM
IDM may refer to:

Science and technology
Identity management, the management of the identity life cycle of an entity
Novell Identity Manager software, now called NetIQ Identity Manager
Integrated data management
Integrated document management
Integrated device manufacturer, a type of semiconductor company which designs, manufactures, and sells integrated circuit products
Integrated Direct Metering, a real-time TTL metering method for ambient and flashlight employed by the Pentax LX
Intelligent device management, a type of enterprise software applications
Intelligent driver model, a microscopic traffic flow model
Internet Download Manager, a closed source software download manager
Infant of a diabetic mother, in medicine; for example see Respiratory disease#Neonatal diseases

Organizations
IDM (ISP), also known as IncoNet-Data Management S.A.L., an internet service provider
IDM Computer Solutions, creators of the UltraEdit text editor
Impact Direct Ministries, a non-profit organization
Institute for Disease Modeling, epidemiological research organization in Bellevue, Washington

Music
Intelligent dance music, a subgenre of electronic music
Industrial dance music, a fusion of industrial and electronic dance music

Other uses
Intelligent design movement, a religious campaign promoting the pseudoscientific idea of intelligent design