| STDC | Sales Tax Deduction Calculator 
| Others |
| STDC | Sexually Transmitted Disease Control (state government program)
| Others |
| STDC | Sindh Transmission and Dispatch Company
| Others |
| STDC | South Taranaki District Council (New Zealand)
| Others |
| STDC | South Texas Development Council
| Others |
| STDC | South Tipperary Development Company
| Others |
| STDC | State Tax Deduction Calculator
| Others |
| STDC | State Tourism Development Corporation (India)
| Others |
| STDC | Stay Top Dead Center
| Others |
| STDC | Strategic Tactics Development Center
| Others |