| Acronym | Definition |
|---|
| SIOP | Single Integrated Operational Plan (US military) |
| SIOP | Sheltered Instruction Observation Protocol |
| SIOP | Scalable Input Output Project |
| SIOP | Société Internationale d'Oncologie Pédiatrique (International Society of Pediatric Oncology) |
| SIOP | Single Integrated Operation Plan |
| SIOP | Sales & Inventory Operations Planning (sales demand forecasting & operations planning operation rates & resources) |
| SIOP | Social Infrastructure Operational Programme (various locations) |
| SIOP | SCSI I/O Processor |
| SIOP | Strategic Integrated Operations Plan |
| SIOP | Society for Industrial & Organizational Psychology, Inc. |
| SIOP | Structural Improvement of Operational Aircraft |
| SIOP | Secure Identification Operating Procedure |
| SIOP | Supplier Interface and Oversight Program |
| SIOP | Société Industrielle de l'Ouest Parisien (French: Industrial Company of Paris West; Paris, France) |