| Abbreviation | Definition |
|---|---|
| SCU | Scott Credit Union |
| SCU | Service Credit Union |
| SCU | State Credit Union |
| SCU | Sydney Credit Union |
| SCUF | Shriram City Union Finance |
| SDA | Shop, Distributive and Allied Employees' Association |
| SDCU | Selale Dairy Cooperative Union |
| SDCU | Shiremoor and District Credit Union |
| SDCU | South Division Credit Union |
| SDCU | Summerland and District Credit Union |
| SDFCU | State Department Federal Credit Union |
| SDFCU | State Dept Federal Credit Union |
| SDKB | Schwäbisch-Deutschen Kulturbundes (Swabian German Cultural Union) |
| SDTU | Sign and Display Trades Union |
| SDUM | Social Democratic Union of Macedonia |
| SDUT | San Diego Union Tribune |
| SDUT | San Diego Union-Tribune |
| SECU | Schlumberger Employees Credit Union |
| SECU | SLB Employees Credit Union |
| SECU | State Employees Credit Union |