| Acronym | Definition |
|---|
| ASI | ATV (All Terrain Vehicle) Safety Institute |
| ASI | Agenzia Spaziale Italiana (Italian Space Agency) |
| ASI | Advertising Specialty Institute (promotional products industry Association) |
| ASI | American Statistics Index (LexisNexis publication) |
| ASI | Advanced Solutions International |
| ASI | Australasian Society for Immunology |
| ASI | Archaeological Survey of India |
| ASI | Amorphous Silicon |
| ASI | Addiction Severity Index (substance abuse) |
| ASI | Adhesives & Sealants Industry (magazine) |
| ASI | Adam Smith Institute (UK) |
| ASI | American Sheep Industry Association |
| ASI | Asynchronous Serial Interface (digital television) |
| ASI | American Share Insurance |
| ASI | American Society of Indexers |
| ASI | American Swedish Institute (Minneapolis, Minnesota) |
| ASI | Assistant Sub Inspector |
| ASI | Actuator Sensor Interface |
| ASI | Advanced Switching Interconnect |
| ASI | Author Services, Inc |
| ASI | Additional Skill Identifier |
| ASI | Airspeed Indicator |
| ASI | Aviation Safety Inspector (FAA) |
| ASI | Australian Steel Institute (North Sydney) |
| ASI | Asociación Salvadoreña de Industriales (Spanish: Salvadoran Industrial Association) |
| ASI | American Supplier Institute |
| ASI | Air-Sea Interaction |
| ASI | Annual Survey of Industries (India) |
| ASI | America's Shield Initiative |
| ASI | Algoma Steel Inc. |
| ASI | Applied Sciences Inc. (Cedarville, OH) |
| ASI | Access Services Inc |
| ASI | Association of Surgeons of India |
| ASI | Advanced Structures Inc. |
| ASI | Actuarial Society of India |
| ASI | Advanced Scientific Instruments (Herbert Knauer GmbH) |
| ASI | AARP Services Inc. |
| ASI | Advertising Specialties, Inc. (Boca Raton, FL) |
| ASI | ATM Service Interface (Cisco) |
| ASI | Arterial Stiffness Index |
| ASI | Adapter Support Interface |
| ASI | Application Solutions Inc. |
| ASI | Automatic Systems, Inc. (Kansas City, Missouri) |
| ASI | Aerospace Science Instructor (AFJROTC) |
| ASI | Applied Systems Intelligence, Inc |
| ASI | Asynchronous SCSI Interface |
| ASI | Austral Summer Institute |
| ASI | Audience Studies, Inc |
| ASI | Architect's Supplemental Instructions |
| ASI | Assessment Strategies Inc (Ottawa, ON, Canada) |
| ASI | Automotive Services, Inc. |
| ASI | Advanced Sciences Inc. (Oak Ridge, TN) |
| ASI | Associated Systems Inc (Fredericksburg, VA) |
| ASI | Air Safety Investigator |
| ASI | Alternative Solutions Inc. (East Hartford, CT) |
| ASI | Ahorro Sistematico Integral (Mexico) |
| ASI | Armor Systems International |
| ASI | Albert Schweitzer Institute (Hamden, Connecticut) |
| ASI | Andrews Software, Inc. (Cleveland, OH) |
| ASI | Alzheimer Society of Ireland |
| ASI | Alternate Space Inversion |
| ASI | Adjacent Satellite Interference |
| ASI | Augmented Spark Igniter |
| ASI | Agencia de Seguridad Israelí (Guatemala security agency) |
| ASI | America Standards Institute |
| ASI | Agency Safety Initiative (NASA) |
| ASI | Actor Sensor Interface |
| ASI | Achats Service International (Niger) |
| ASI | African Strategic Impact (Bujumbura, Burundi) |
| ASI | Automated Shore Interface |
| ASI | Aircraft Station Interface |
| ASI | Analytical Services, Incorporated |
| ASI | assign and display switch initialization (US DoD) |
| ASI | Axial Shape Index (nuclear reactors) |
| ASI | Army Space Institute |
| ASI | Aerospace Studies Institute |
| ASI | All Staffing, Inc. |
| ASI | Asphaltene Stability Index (stability of asphaltene species within a grade of crude oil) |
| ASI | Alarm Status Indicator |
| ASI | Agri Sales, Inc. |
| ASI | Automated System Initialization |
| ASI | Assign Switch Initialization |
| ASI | Access Server Integration |
| ASI | Artificial Social Intelligence |
| ASI | Associate of the Securities & Investment Institute |
| ASI | Accuracy Support Infrastructure |
| ASI | Alenia Marconi Systems, Inc. |
| ASI | Aircraft System Interface |
| ASI | Acquisition Streamlining Initiative |
| ASI | Authorized Service Interruption (DOD) |
| ASI | Atlanta Suzuki Institute (Atlanta, Georgia) |
| ASI | Axial Scientific Instrument |
| ASI | Acrobat Systems Incorporated |
| ASI | Azimuth Speed Indicator |
| ASI | Advanced Science Instrument |
| ASI | Ampere-Second Integration |
| ASI | Advanced Services Implementation |
| ASI | Adroit Systems Incorporated |
| ASI | Agencia Spatiale Italiano |
| ASI | Advanced Technology International, Incorporated |
| ASI | Adverse System Interaction |
| ASI | Apex Security & Investigations |
| ASI | Alex Software Inc. |
| ASI | Ancillae Secular Institute |
| ASI | Architectural and Surveying Institute |
| ASI | Application Specific Increment |
| ASI | Automatic SACCS Interface |
| ASI | Aircraft Supplementary Information (Royal Australian Air Force) |
| ASI | Advanced Studies Institute of NATO |
| ASI | Atlantic Studies Institute (University of Michigan) |
| ASI | Astrological Society of India |
| ASI | Advanced Simulation Initiative |
| ASI | Assisted Self Install |
| ASI | Arc Second Imager |
| ASI | Agency Selection Inventory |
| ASI | Amended Shipping Instrument |
| ASI | Austin Semiconductor Incorporated |
| ASI | Art Street Interactive, Inc (San Diego, CA) |
| ASI | Any Soldier, Inc. |
| ASI | All Systems Installations, Inc (Algonquin, IL) |
| ASI | Advanced Stucco of Iowa |