| IWMS | Identified Wildlife Management Strategy 
| Others |
| IWMS | Inside Wire Maintenance Service
| Others |
| IWMS | Integrated Waste Management Section
| Others |
| IWMS | Integrated Waste Management Service
| Others |
| IWMS | Integrated Waste Management Solution
| Others |
| IWMS | Integrated Waste Management Strategy
| Others |
| IWMS | Integrated Waste Management System
| Others |
| IWMS | Integrated Water Management System
| Others |
| IWMS | Integrated Wireless Management System
| Others |
| IWMS | Integrated Workplace Management System
| Others |
| IWMS | Intel Wireless Management Service
| Others |
| IWMS | International Warehouse Management System
| Others |
| IWMS | Irrigation Water Management Society
| Others |
| IWMS | ISEM (Integrated Safety and Environmental Management) Work Management System
| Others |