| Abbreviation | Definition |
|---|---|
| SIMI | Society of the Irish Motor Industry |
| SIMP | Polish Association of Mechanical Engineers and Technicians |
| SIMP | Stowarzyszenie Inynierw i Technikw Mechanikw Polskich |
| SIMP | Stowarzyszenie Inzynierów i Techników Mechaników Polskich |
| SIN | Italian Society of Neurology |
| SIN | Societ Italiana di Neurologia |
| SIN | Società Italiana di Neurologia |
| SINE | Society for Innovation and Entrepreneurial |
| SINHAS | Studies In Nepali History And Society |
| SIO | Society of Interventional Oncology |
| SIOP | Society for Industrial and |
| SIOR | Society of Industrial and Office Realtors |
| SIOR | Society Of Industrial Office Realtors |
| SIP | Italian Society of Pediatrics |
| SIP | Societ Italiana di Pediatria |
| SIP | Società Italiana di Pediatria |
| SIP | Society for Invertebrate Pathology |
| SIPCO | Society of Indonesian Professional Convention Organizers |
| SIPES | Society of Independent Professional Earth Scientists |
| SIPs | Italian Society of Psychology |