| Acronym | Definition |
|---|
| SMSI | Smith Micro Software Inc. (mobile software products) |
| SMSI | Simplified Message Service Interface |
| SMSI | Système de Management de La Sécurité de l'Information (French: Information Safety Management System) |
| SMSI | sommet mondial de la société de l'information |
| SMSI | Système de Mise En Sécurité Incendie (French: Fire Safety System Setting) |
| SMSI | System Management Software, Inc. (St. Paul, MN) |
| SMSI | Segmented Marketing Services, Inc. (Winston-Salem, NC) |
| SMSI | Strong Metal-Support Interaction |
| SMSI | Siemens Medical Systems, Inc. (supplier) |
| SMSI | Saint-Mamet Saisie Informatique (French: Saint Mamet Data Entry) |
| SMSI | Sustainable Manufacturing Sourcing Index (Nike) |