| Acronym | Definition |
|---|
| SMX | Search Marketing Expo |
| SMX | Sulfamethoxazole |
| SMX | Secure Mode Extensions |
| SMX | Script Mib Extensibility Protocol |
| SMX | Stereo Mixer |
| SMX | Sumitomo Shoji Machinex (Japanese consulting firm) |
| SMX | Server Macro Expansion |
| SMX | Santa Maria, CA, USA - Santa Maria Public Airport (Airport Code) |
| SMX | Smithway Motor Xpress, Inc. |
| SMX | SonicsMX |
| SMX | Alitalia Express, Italy (ICAO code) |
| SMX | Synchronous Multiplexer |
| SMX | SniffMaster for X |
| SMX | Strand MultipleX (theater lighting) |
| SMX | Sprint Message Xchange |
| SMX | Stockholm Money Market Exchange |