SIZ
| Acronym | Definition |
|---|---|
| SIZ | Schweizerisches Informatik-Zertifikat (German: Swiss Computer Science Certificate; Switzerland) |
| SIZ | Informatikzentrum der Sparkassenorganisation (Bonn, Germany) |
| SIZ | Stahl-Informations-Zentrum (German: Steel Information Center) |
| SIZ | Special Industrial Zone (Balochistan, Pakistan) |
| SIZ | Seasonal Ice Zone |
| SIZ | Sediment Impact Zone |
| SIZ | Security Identification Zone |