| Rank | Abbreviation | Meaning |
|---|
| ***** | STDC | State Tourism Development Corporation
| |
| *** | STDC | SmartStream Terminal Data Collector
| |
| *** | STDC | Sustainable Tourism Development Committee
| |
| *** | STDC | Sexually Transmitted Disease Control
| |
| *** | STDC | South Taranaki District Council
| |
| *** | STDC | Sexually Transmitted Disease Cases
| |
| *** | STDC | Stay Top Dead Center
| |
| ** | STDC | Sustainable Tourism Development Center
| |
| ** | STDC | Science and Technology Development Corporation
| |
| ** | STDC | Science and Technology Development Center
| |
| * | STDC | Standards Council of Canada
| |
| * | STDC | Shrewsbury Training Development Centre
| |
| * | STDC | South Texas Development Council
| |
| * | STDC | Software Tool and Die Company
| |
| * | STDC | Surface Tension Driven Convections
| |
| * | STDC | Siemens Technology Development Co
| |
| * | STDC | Sha Tsui Detention Centre
| |
| * | STDC | Science and Technology for Developing Countries
| |
| * | STDC | Software Training & Development Centre
| |
| * | STDC | Space Technology Development Corporation
| |
| * | STDC | Stop the Disappearances Campaign
| |
| * | STDC | Sycuan Tribal Development Corporation
| |
| * | STDC | Sarawak Timber Development Corporation
| |
| * | STDC | Sharjah Training and Development Center
| |
| * | STDC | Sha Tin District Council
| |