| SIAP | Safety Incentive Award Programs 
| Others |
| SIAP | Sage Intacct Accountants Program
| Others |
| SIAP | Saskatchewan Indian Agriculture Program
| Others |
| SIAP | Scandinavian Institute Of Aviation Psychology
| Others |
| SIAP | Security in Iraq Accountability Panel
| Others |
| SIAP | Sensitive Industry Affected Parties
| Others |
| SIAP | Shut In Annular Pressure
| Others |
| SIAP | Siapsingle Integrated Air Picture
| Others |
| SIAP | Single Integrated Air Picture
| Others |
| SIAP | Sistema Integrado de Atos de Pessoal
| Others |
| SIAP | Site Integrated Assessment Plan
| Others |
| SIAP | Social Impact of the Arts Project
| Others |
| SIAP | Social Innovation Acceleration Program
| Others |
| SIAP | Societe Immobiliere de lArrondissement de Pithiviers
| Others |
| SIAP | Sorry If Already Posted
| Others |
| SIAP | Southern Internal Audit Partnership
| Others |
| SIAP | Speakers Information Activity Package
| Others |
| SIAP | Stable Image Assurance Program
| Others |
| SIAP | Standard Instrument Approach Procedure
| Others |
| SIAP | Standards Implementation Action Plan
| Others |
| SIAP | Statistical Institute for Asia and Pacific
| Others |
| SIAP | Strategic Information Assurance Program
| Others |
| SIAP | Strengthening Industry Academia Partnership
| Others |
| SIAP | Support for the Individual Artist Programme
| Others |
| SIAP | Surveillance Integration Automation Project
| Others |
| SIAP | System Integrity Assurance Program
| Others |