WMS
- WMS (hydrology software)
- WMS Gaming
- WMS Industries
- Warehouse management system
- Warwick Medical School
- Warwick University
- Web Map Service
- Wechsler Memory Scale
- Welfare Management System (NYC)
- West Monmouth School
- White Mountain School
- Wilderness Medical Society
- Williams Medical Supplies
- Windows Media Services
- Windows MultiPoint Server
- Workflow management system
- Workload management system
- Written ministerial statement