| STAG | School Transport Action Group 
| Others |
| STAG | Scottish Transport Appraisal Guidance
| Others |
| STAG | Security Techniques Advisory Group
| Others |
| STAG | Service Tag
| Others |
| STAG | Sevenoaks Theatre Action Group
| Others |
| STAG | Sheffield Tree Action Groups
| Others |
| STAG | Sherborne Transport Action Group
| Others |
| STAG | Shuttle Turnaround Analysis Group
| Others |
| STAG | Singapore Toyota Altis Group
| Others |
| STAG | Single Tenant Acquisition Group
| Others |
| STAG | Single Theme Ad Group
| Others |
| STAG | Some Transgenders Are Guys
| Others |
| STAG | Special Tactical Anti Gang
| Others |
| STAG | Special Tactics Against Godzilla
| Others |
| STAG | Speedy Type Adapter Generation
| Others |
| STAG | Split-Thickness AutoGraft
| Others |
| STAG | Stand Tall Against Giants
| Others |
| STAG | Stand There And Grind
| Others |
| STAG | State and Tribal Assistance Grants
| Others |
| STAG | Steam Turbine And Generator
| Others |
| STAG | Stiff Toetea Attracts Girls
| Others |
| STAG | Strategic and Technical Advisory Group
| Others |
| STAG | Strategic Tactical Analysis Group
| Others |
| STAG | Strength To Achieve Greatness
| Others |
| STAG | Strike Throw And Go
| Others |
| STAG | Strike, Throw, And Go
| Others |
| STAG | Strippers That Are Greasy
| Others |
| STAG | STudent AGitation
| Others |
| STAG | Student Theatre At Glasgow
| Others |
| STAG | Students That Are Graduates
| Others |
| STAG | Summer Touring Activities Group
| Others |
| STAG | Super Terrifying Anti Gremlins
| Others |
| STAG | System Training Advisory Group
| Others |