| Acronym | Definition |
|---|
| DSI | Decision Sciences Institute |
| DSI | Department of Special Investigation (Thailand) |
| DSI | Directeur des Systèmes d'Information (French: Director of Information Systems; various organizations) |
| DSI | Direction des Systèmes d'Information (French: Directorate of Information Systems; France and Switzerland) |
| DSI | Dipartimento di Scienze dell'Informazione (Italian university) |
| DSI | Data Storage Institute |
| DSI | Data Systems International |
| DSI | Dienst Speciale Interventies (Dutch counterterrorism unit) |
| DSI | Dealer Satisfaction Index |
| DSI | Defense Simulation Internet |
| DSI | Digital Speech Interpolation |
| DSI | Dual Sequential Ignition (Honda automotive engine technology) |
| DSI | Diseminación Selectiva de Información (Spanish) |
| DSI | Devlet Su Isleri (Turkish state water works) |
| DSI | Dirty South Improv (Carrboro, North Carolina) |
| DSI | Delivered Source Instructions |
| DSI | Dominican Sisters International (Rome) |
| DSI | Data Securities International |
| DSI | Destin, FL, USA (Airport Code) |
| DSI | Development Strategy Institute (Vietnam) |
| DSI | Data Sharing and Interoperability |
| DSI | Dial Services Interface |
| DSI | Devry Student ID |
| DSI | Deutsche Schule Istanbul (German high school, Istanbul, Turkey) |
| DSI | Dayananda Sagar Institutions |
| DSI | Data Subscriber Interface |
| DSI | Defense Security Intelligence |
| DSI | Division of Services Improvement |
| DSI | Dansk System Industri A/S |
| DSI | Data Set Interface |
| DSI | Defense Security Institute |
| DSI | Data Systems Inquiry |
| DSI | Dual Stage Inflator (air bag) |
| DSI | Daily Stock Inventory |
| DSI | Data Service Interface |
| DSI | Developmental Science Initiative |
| DSI | Distilled Spirits Institute |
| DSI | Diversified Services for Industry, Inc |
| DSI | Declared Site Inspection |
| DSI | Datawest Solutions Inc |
| DSI | Direct Switch Interface |
| DSI | Data Security Insurance |
| DSI | Data Security Interface |
| DSI | Dissimilar Source Integration |
| DSI | Driver Style Identifier |
| DSI | Download Server Initiate Control Message |
| DSI | Direct Signal Interference |
| DSI | Dealer Self-Inspection (automotive sales) |
| DSI | Defense Suppression Integration |
| DSI | Defense System Information |
| DSI | Day Sales Inventory |
| DSI | De Sua Impensa (Latin: At His Own Expenses, epigraphy) |
| DSI | Descendants Similarity Inheritance |
| DSI | Digital Systems International Inc. |
| DSI | Daiichi Sankyo, Inc. (Parsippany, NJ) |
| DSI | Dysfunction in Sensory Integration |
| DSI | Dutch Securities Institute |
| DSI | Direct Service Industry |
| DSI | Data Systems, Inc. (various locations) |
| DSI | Distribution and Service, Inc. (Fairfax, VA) |
| DSI | Digital Switch Interface |
| DSI | Drought Severity Index |
| DSI | Distributed Storage Infrastructure |
| DSI | Document Solutions, Inc. |
| DSI | Dual Sensory Impairment(s) |
| DSI | Dynamic Skeleton Interface (CORBA server-side API) |
| DSI | Disease Severity Index |
| DSI | DYWIDAG Systems International |
| DSI | Development Studies Institute |
| DSI | Direct Spark Ignition (propane fired appliances) |
| DSI | Digital Spot Imaging (diagnostic technique) |
| DSI | Dynamic Systems Initiative (Microsoft) |
| DSI | Design Services, Inc. (various locations) |
| DSI | Dry Sorbent Injection |