| Rank | Abbreviation | Meaning |
|---|
| ***** | MWSA | Municipal Water Supply Agency
| |
| ***** | MWSA | Montana Wilderness Study Area
| |
| ***** | MWSA | Military Writers Society of American
| |
| **** | MWSA | Manly Warringah Softball Association
| |
| *** | MWSA | Motorway Service Area
| |
| *** | MWSA | Mayer wave-like sinus arrhythmia
| |
| *** | MWSA | Maldives Water and Sanitation Authority
| |
| *** | MWSA | Massachusetts Woman Suffrage Association
| |
| *** | MWSA | Ministry of Work and Social Affairs
| |
| ** | MWSA | Master Water Supply Agreement
| |
| ** | MWSA | Manly Warringah Soccer Association
| |
| * | MWSA | Messaging and Web Security Appliances
| |
| * | MWSA | Michigan Water Ski Association
| |
| * | MWSA | Mill Woods Soccer Association
| |
| * | MWSA | Minnesota Water Ski Association
| |
| * | MWSA | Manzano Weapons Storage Area
| |
| * | MWSA | Mountain West String Academy
| |
| * | MWSA | Municipal Water and Sewer Authority
| |
| * | MWSA | Media Whore Studios All
| |
| * | MWSA | Minnesota Woman Suffrage Association
| |
| * | MWSA | Maynilad Water Supervisors Association
| |
| * | MWSA | Mid West Sociological Association
| |
| * | MWSA | Minang Warman Sofyan Associates
| |
| * | MWSA | Masters, Wardens and Secretaries Association
| |
| * | MWSA | Ministry of Women and Social Action
| |