| WISA | Water Institute of Southern Africa 
| Others |
| WISA | Wellbeing in Schools Australia
| Others |
| WISA | West Indies States Association
| Others |
| WISA | Western India Sports Association
| Others |
| WISA | Westfield Infant School Association
| Others |
| WISA | Wheaton Ice Skating Academy
| Others |
| WISA | Wiltshire Independent Support and Advice
| Others |
| WISA | Wimbledon Independent Supporters Association
| Others |
| WISA | Wine Industry Suppliers Australia
| Others |
| WISA | Wireless Interface for Sensors and Actuators
| Others |
| WISA | Wireless Interface to Sensors and Actuators
| Others |
| WISA | Wisconsin Industrial Sand Association
| Others |
| WISA | Wisconsin Safety Analyzer
| Others |
| WISA | Wisconsin Squash Association
| Others |
| WISA | Women In Sales Awards
| Others |
| WISA | Women In STEM Ambassadors
| Others |
| WISA | Women in Student Affairs
| Others |
| WISA | Women in Surgery Africa
| Others |
| WISA | Women In Sustainable Agriculture
| Others |
| WISA | Work Incentive Specialist Advocacy
| Others |
| WISA | Workshop on Information Security Applications
| Others |