| Acronym | Definition |
|---|
| TSSU➣Teaching Support Staff Union (Canada) |
| TSSU➣Tactically Self-Sufficient Unit (various locations) |
| TSSU➣True Sandwich Salad Unit (product) |
| TSSU➣Theatre Sterile Services Unit (Spire Portsmouth Hospital; UK) |
| TSSU➣Theater Sterile Supply Unit (hospital unit) |
| TSSU➣Traffic Signal Services Unit (Oregon Department of Transportation) |