| Acronym | Definition |
|---|
| SSU➣Small Subunit |
| SSU➣Sonoma State University |
| SSU➣Savannah State University (Savannah, Georgia) |
| SSU➣Shawnee State University (Ohio) |
| SSU➣Superior State University (Michigan) |
| SSU➣Salem State University (Massachusetts) |
| SSU➣Sacramento State University |
| SSU➣Security Service of Ukraine |
| SSU➣Sunny-Side Up |
| SSU➣Sunny Side Up |
| SSU➣Salisbury State University |
| SSU➣Southampton Solent University (UK) |
| SSU➣Synchronization Supply Unit (Nortel) |
| SSU➣Sveriges Socialdemokratiska Ungdomsförbund |
| SSU➣System Start up |
| SSU➣Select Size Unit |
| SSU➣Start Stop Unit |
| SSU➣Super Sport Utility |
| SSU➣System Setup Utility |
| SSU➣Special Services Unit |
| SSU➣Strategic Services Unit (US DoD) |
| SSU➣System Software Update |
| SSU➣Süleyman Sah University (Istanbul, Turkey) |
| SSU➣Sequential Shunt Unit |
| SSU➣Shared Services Unit |
| SSU➣Session Support Utility |
| SSU➣Stratospheric Sounding Unit |
| SSU➣Satellite Student Union (California) |
| SSU➣Syktyvkar State University (Russia, Komi) |
| SSU➣Saybolt Seconds, Universal (viscosity) |
| SSU➣Ship Support Unit (US Navy) |
| SSU➣Secondary Sampling Unit |
| SSU➣Staff Support Unit |
| SSU➣Sabbath School University (Michigan) |
| SSU➣Adele H. Stamp Student Union (building code; University of Maryland) |
| SSU➣Synchronisation Supply Unit (ITU) |
| SSU➣Squadron Service Unit (US DoD) |
| SSU➣Subsequent Signal Unit |
| SSU➣Sight Survey Unit (target/sighting, military helicopter) |
| SSU➣Single Subscriber Unit |
| SSU➣System Synchronization Unit (Newbridge) |
| SSU➣System Supervisory Unit |
| SSU➣Sub-Sectoral Units |
| SSU➣Supply and Service Union (Canada) |
| SSU➣Services & Support Unit |
| SSU➣System Services and Utilities |
| SSU➣Surface Screen Unit |
| SSU➣Surface Sensitivity Unit |
| SSU➣Société Suisse d'Urologie (French: Swiss Society of Urology; Switzerland; est. 1994) |
| SSU➣Super Scoop Up (Pokemon) |
| SSU➣Shift Start-Up (various organizations) |
| SSU➣Subsea and Umbilicals (energy exploration) |
| SSU➣State Sites Unit (Illinois Environmental Protection Agency) |
| SSU➣Software Size Unit |