| SAI | Strategic Artificial Intelligence 
| Others |
| SAI | Student Achievement Initiative
| Others |
| SAI | Student Assessment of Instruction
| Others |
| SAI | Study Abroad Italy
| Others |
| SAI | Subeta Agency of Intelligence
| Others |
| SAI | Sudden Acceleration Incidents
| Others |
| SAI | Summer Agricultural Institute
| Others |
| SAI | Sun Academic Initiative
| Others |
| SAI | Sundberg Architectural Initiative
| Others |
| SAI | Super Army Infantry
| Others |
| SAI | Supervisory Assistance Incentive
| Others |
| SAI | Supplemental Academic Instruction
| Others |
| SAI | Sustainable Agriculture Initiative
| Others |
| SAI | Sweet Adelines International
| Others |
| SAI | Switch Abstraction Interface
| Others |
| SAI | Swivel Axis Inclination
| Others |
| SAI | Synthetic Artificial Individual
| Others |
| SAI | Systems Alliance Inc
| Others |
| SAI | Systems Associates Inc
| Others |
| SAI1 | Special Artificer (instruments) 1st Class Petty Officer
| Others |
| SAI2 | Special Artificer (instruments) 2nd Class Petty Officer
| Others |
| SAI3 | Special Artificer (instruments) 3rd Class Petty Officer
| Others |
| SAIA | San Antonio International Airport
| Others |
| SAIA | Scaffold Access Industry Association
| Others |
| SAIA | Scaffold and Access Industry Association
| Others |
| SAIA | Secret Abbreviation Interstate Association
| Others |
| SAIA | Senior Air Interdiction Agent
| Others |
| SAIA | Service Attitude Ingenuity And Achievement
| Others |
| SAIA | Sincere Ambitious Inspiring Attentive
| Others |
| SAIA | Slovak Academic Information Agency
| Others |
| SAIA | South African Institute of Architects
| Others |
| SAIA | South African Insurance Association
| Others |
| SAIA | Southern Area Instructors Association
| Others |
| SAIA | Student Association Of International Awareness
| Others |
| SAIA | Students Against Israeli Apartheid
| Others |
| SAIA | Succubus and Incubus Academy
| Others |
| SAIA | Sustainable Aquarium Industry Association
| Others |
| SAIA | Swedish Artificial Intelligence Archive
| Others |
| SAIAA | South Atlantic Intercollegiate Athletic Association
| Others |
| SAIAB | South African Institute for Aquatic Biodiversity
| Others |
| SAIB | Argentine Society for Biochemical and Molecular Biology Research
| Others |
| SAIB | Science Assessment And Integration Branch
| Others |
| SAIB | Source Approval Information Booklet
| Others |
| SAIB | Special Airworthiness Information Bulletin
| Others |
| SAIB | Special Airworthiness Information Bulletins
| Others |
| SAIB | Swiss Accident Investigation Board
| Others |
| SAIC | Argentine Society of Clinical Research
| Others |
| SAIC | School of the Art Institute of Chicago
| Others |
| SAIC | Science Applications International Corporation
| Others |
| SAIC | Scientific Applications International Corporation
| Others |