| Acronym | Definition |
|---|
| RTSD➣Radnor Township School District (Wayne, PA) |
| RTSD➣Resources and Technical Services Division (American Library Association) |
| RTSD➣Rebuilding Together San Diego (formerly Christmas in April; California; est. 1995) |
| RTSD➣Railroad Transportation Safety District (Nebraska) |
| RTSD➣Real-Time Software Design (course) |
| RTSD➣Richardton-Taylor School District (North Dakota) |