| WSSD | LPFM-88.1, Chicago, Illinois 
| Others |
| WSSD | Waldorf School of San Diego
| Others |
| WSSD | Wallingford Swarthmore School District
| Others |
| WSSD | Wallingford- Swarthmore School District
| Others |
| WSSD | Wargames Simulation Scenario Development
| Others |
| WSSD | Washington Suburban Sanitary District
| Others |
| WSSD | Water Supply and Sewerage Department
| Others |
| WSSD | Weapon System Support Development
| Others |
| WSSD | Websphere Studio Site Developer
| Others |
| WSSD | Wellness and Sport Sciences Department
| Others |
| WSSD | West Shore School District
| Others |
| WSSD | West Side School District
| Others |
| WSSD | Windows Server Software Defined
| Others |
| WSSD | Windows Server Software Defined Datacenter
| Others |
| WSSD | Within Segment Standard Deviation
| Others |
| WSSD | World Summit for Social Development
| Others |
| WSSD | World Summit for Sustainable Development
| Others |
| WSSD | World Summit on Sustainable Development
| Others |
| WSSD | World Symposium on Sustainable Development
| Others |