| Acronym | Definition |
|---|
| MTSD➣Millcreek Township School District (Erie, PA) |
| MTSD➣Mequon-Thiensville School District (Mequon, WI) |
| MTSD➣Manheim Township School District (Lancaster, PA) |
| MTSD➣Mother Truckin Skull Diggers (band) |
| MTSD➣Multichannel Two-Stage Sequential Detector |
| MTSD➣Magnetic Tape Storage Device |