| Acronym | Definition |
|---|
| STX | South Texas (various organizations) |
| STX | Sales Tax |
| STX | Shiga Toxin |
| STX | Studentereksamen (Danish high-school certificate) |
| STX | Saxitoxin (toxin) |
| STX | Start of Text |
| STX | Street Touring X (amateur racing) |
| STX | Situational Training Exercise |
| STX | Syntaxin (cell membrane protein) |
| STX | Syntax |
| STX | Stub Network |
| STX | S-Band Transmitter |
| STX | Smart Text |
| STX | Short Tagged Xml |
| STX | Store Index |
| STX | Seagate Technology |
| STX | Structured Text |
| STX | Staff Training Exercise |
| STX | Store X (6502 processor instruction) |
| STX | Smarter Technology eXtension |
| STX | St Croix Island, VI, USA (Airport Code) |
| STX | Star Trek: X (Nemesis) |
| STX | Squad Training Exercise |
| STX | System Technology Excellency (South Korea) |
| STX | SNA to X.25 |