| SIA | Semajno de Internacia Amikeco | In Esperanto | |
| SIA | Société suisse des Ingénieurs et des Architectes = SIA | Schweizerischer Ingenieur- und Architekten-Verein | In German |
In French | → Organizations and associations → Engineering, technology → Architecture |
| SIA | Schweizerischer Ingenieur- und Architekten-Verein = (look above) |
In German | → Organizations and associations → Engineering, technology → Architecture |
| SIA | Società Italiana di Andrologia | In Italian | → Organizations and associations → Sexual problems → Urology |
| SIA | Société des Ingénieurs de l'Automobile | In French | → Organizations and associations → Automobile manufacturing |
| SIA | Salon International de l'Agriculture | In French | → Agricultural sciences |
| SIA | Software Impact Assessment | In English | → Software |
| SIA | Solar Inertial Attitude | In English | |
| SIA | Structural Interface Adapter | In English | |
| SIA | System Integration Area | In English | |
| SIA | Société d'Investissement en Autriche | In French | → Finance |