| SItI | Italian Society for Hygiene, Preventive Medicine and Public Health 
| Others |
| SITI | Saratoga International Theater Institute
| Others |
| SITI | Saratoga International Theatre Institute
| Others |
| SITI | Shell Information Technology International
| Others |
| SITI | Sindacato Italiano Tutela Investimento
| Others |
| SITI | Software and Information Technology of Iowa
| Others |
| SITI | Sold Inside Ticketed Inside
| Others |