| Acronym | Definition |
|---|
| SUM | Summary |
| SUM | Salón de Usos Múltiples (Spanish: Multipurpose Room) |
| SUM | Sumerian (non-Indo-European; linguistics) |
| SUM | Stanford University Medical (various locations) |
| SUM | Startup Manager (software) |
| SUM | State of the Union Message |
| SUM | Scalable Uncertainty Management |
| SUM | Software Update Manager |
| SUM | Summum |
| SUM | Security Update Manager |
| SUM | Software Updates Management |
| SUM | Senter for utvikling og miljø (Centre for Development and the Environment; Norway) |
| SUM | Service Usage Model (computing) |
| SUM | Sumas, Washington (border patrol station) |
| SUM | Software User's Manual |
| SUM | System User's Manual |
| SUM | Summary of Unadjusted Misstatements |
| SUM | Servicio Universitario Mundial (Spanish: World University Service) |
| SUM | Supreme Update Mod (National Basketball Association) |
| SUM | supramammillary nucleus |
| SUM | Surface-to-Underwater Missile |
| SUM | Single Event Upset Monitor |
| SUM | System Utility Module |
| SUM | Single User Monitor |
| SUM | Stupid User Mistake |
| SUM | Science Utilization Management |
| SUM | Simplified Unified Messaging |
| SUM | Spacecraft User Manual |
| SUM | Standard USAREUR Munitions |
| SUM | Sony U-Matic Videotape |
| SUM | Small Submarine Underwater Module |