| Acronym | Definition |
|---|
| DSI | Decision Sciences Institute |
| DSI | DYWIDAG Systems International |
| DSI | Deep Sky Imager (astrophotography) |
| DSI | Department of Special Investigation (Thailand) |
| DSI | Data Systems, Inc. (various locations) |
| DSI | Directeur des Systèmes d'Information (French: Director of Information Systems; various organizations) |
| DSI | Direct Spark Ignition (propane fired appliances) |
| DSI | Design Services, Inc. (various locations) |
| DSI | Document Solutions, Inc. |
| DSI | Destination Software, Inc. (est. 2001; Moorestown, NJ) |
| DSI | Direction des Systèmes d'Information (French: Directorate of Information Systems; France and Switzerland) |
| DSI | Daiichi Sankyo, Inc. (Parsippany, NJ) |
| DSI | Dry Sorbent Injection |
| DSI | Dipartimento di Scienze dell'Informazione (Italian university) |
| DSI | Data Service & Information (various companies) |
| DSI | Data Science Initiative (various schools) |
| DSI | Digital Systems International Inc. |
| DSI | Disease Severity Index |
| DSI | Direct Steam Injection |
| DSI | Dynamic Skeleton Interface (CORBA server-side API) |
| DSI | Drive Select Interface |
| DSI | Dual Sequential Ignition |
| DSI | Data Search Information |
| DSI | Digital Signal Interface |
| DSI | Data Server Interface |
| DSI | Data Stream Interface over Ip |
| DSI | Dual Stage Intake |
| DSI | Dynamic Systems Initiative |
| DSI | Desktop Statistics Integration |
| DSI | Development Studies Institute |
| DSI | Drought Severity Index |
| DSI | Dynamic Systems Initiative (Microsoft) |
| DSI | Dutch Securities Institute |
| DSI | Department of Safety and Inspections (Minnesota) |
| DSI | Défense et Sécurité Internationale (French: Defense and International Security; publication) |
| DSI | Data Storage Institute |
| DSI | Distribution Solutions, Inc. (Plymouth, MA) |
| DSI | Dynamic Solutions International (Englewood, CO) |
| DSI | Detailed Site Investigation (land development; various locations) |
| DSI | Data Systems International |
| DSI | Deutsche Securities, Inc. (Deutsche Bank; Germany) |
| DSI | Dual Sensory Impairment(s) |
| DSI | Dominican Studies Institute (City University of New York) |
| DSI | De Samvirkende Invalideorganisationer (Danish: Federation of Organizations of Disabled People) |
| DSI | Distribution Services Industriels (French: Industrial Distribution Services) |
| DSI | Dysfunction in Sensory Integration |
| DSI | Distributed Storage Infrastructure |
| DSI | Dienst Speciale Interventies (Dutch counterterrorism unit) |
| DSI | Development Services International (various organizations) |
| DSI | Digital Spot Imaging (diagnostic technique) |
| DSI | Distribution and Service, Inc. (Fairfax, VA) |
| DSI | Dealer Satisfaction Index |
| DSI | Defense Simulation Internet |
| DSI | Digital Speech Interpolation |
| DSI | Deliberate Self Injury |
| DSI | Direct Service Industry |
| DSI | Dotation Spéciale pour le Logement des Instituteurs (French: Special Allocation for Housing for Teachers) |
| DSI | Dual Sequential Ignition (Honda automotive engine technology) |
| DSI | Distribution Service International (France) |
| DSI | Diseminación Selectiva de Información (Spanish) |
| DSI | Digital Switch Interface |
| DSI | Dipole Shear Imager (energy production) |
| DSI | Devlet Su Isleri (Turkish state water works) |
| DSI | Discrete Surface Integral (microwave theory) |
| 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 | Dentistes Solidaires et Indépendants (French: United and Independent Dentists) |
| DSI | Du Sordet Immobilier (French real estate firm) |
| 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 | Daily Stock Inventory |
| DSI | Dual Stage Inflator (air bag) |
| DSI | Data Service Interface |
| DSI | Developmental Science Initiative |
| DSI | Distilled Spirits Institute |
| DSI | Declared Site Inspection |
| DSI | Délégation de Service Informatique (French information technology department) |
| DSI | Diversified Services for Industry, Inc |
| DSI | Datawest Solutions Inc |
| DSI | Director's Strategic Initiatives (US Army Research Laboratory) |
| DSI | Data Security Interface |
| DSI | Data Security Insurance |
| DSI | Direct Switch Interface |
| DSI | Download Server Initiate Control Message |
| DSI | Dissimilar Source Integration |
| DSI | Driver Style Identifier |
| DSI | Day Sales Inventory |
| DSI | Direct Signal Interference |
| DSI | Dealer Self-Inspection (automotive sales) |
| DSI | Defense Suppression Integration |
| DSI | Defense System Information |
| DSI | De Sua Impensa (Latin: At His Own Expenses, epigraphy) |
| DSI | Descendants Similarity Inheritance |