WDM is a three-letter abbreviation with multiple meanings, as described below:
- Warm dark matter
- Warm dense matter
- Wavelength-division multiplexing
- wdm, the WINGs Display Manager
- West Des Moines, Iowa
- Western Development Museum of Saskatchewan
- Windows Driver Model
- World Development Movement
- Windows Driver Model a framework for device drivers aimed to replace the VxD system in Windows OS.
WDM could also be the initials of:
- Warith Deen Muhammad (Wallace D. Muhammad), a leader of the Nation of Islam
- Warren Demian Manshel, a U.S. ambassador
- William D. Mitchell, a U.S. Attorney General
- William De Morgan, a tile designer
- William Diller Matthew, a paleontologist
- William Dunn Moseley, a U.S. politician
- Walter Dean Meyers, an American author