TSSU
| 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) |