| SIA | A Self Interstitial Atom 
| Others |
| SIA | Safer Internet Association
| Others |
| SIA | Safety Institute of Australia
| Others |
| SIA | Sales Inducement Asset
| Others |
| SIA | Salon International de l'Automobile
| Others |
| SIA | Samurai In Action
| Others |
| SIA | SatCom Industry Association
| Association, Organization, Space, Technology |
| SIA | Satellite Industry Association
| Others |
| SIA | Schweizerischer Ingenieur- und Architektenverein
| Others |
| SIA | Scsi Industry Association
| Others |
| SIA | Secret Imperial Assassins
| Others |
| SIA | Secretariat For Industrial Assistance
| Others |
| SIA | Securities Industry Act
| Others |
| SIA | Securities Industry Association
| Others |
| SIA | Securities Institute of Australia
| Others |
| SIA | Security Industry Association
| Others |
| SIA | Security Industry Authority
| Others |
| SIA | Security Integration Architecture
| Others |
| SIA | Selector Input Area
| Others |
| SIA | Semiconductor Industries Association
| Others |
| SIA | Semiconductor Industry Association
| Others |
| SIA | Senator Ibikunle Amosun
| Others |
| SIA | Sequence Independent Amplification
| Others |
| SIA | sequential injection technique
| Others |
| SIA | Serial Interface Adapter
| Others |
| SIA | Serum Inhibitory Activity
| Others |
| SIA | Serum-In-Agar
| Others |
| SIA | Service Interval Announcer
| Others |
| SIA | Shadow Investigation Agency
| Others |
| SIA | Shuttle Induced Atmosphere
| Others |
| SIA | sialic acid
| Others |
| SIA | Side Impact Airbag
| Others |
| SIA | Simple Image Access
| Others |
| SIA | Singapore Institute Of Architects
| Others |
| SIA | Singapore International Airlines
| Others |
| SIA | Single Ion Anisotropies
| Others |
| SIA | Singular Indefinite Article
| Others |
| SIA | Slide Immunoenzymatic Assay
| Others |
| SIA | Small Intestine Atresia
| Others |
| SIA | Snowsport Insiders and Alcohol
| Others |
| SIA | SnowSports Industries America
| Others |
| SIA | Sobriety In Action
| Others |
| SIA | Social Impact Assessment
| Others |
| SIA | Societa Degli Ingegneri Dell'Automobile
| Others |
| SIA | Societa Italiana Automobili
| Others |
| SIA | Societe des Ingenieurs de l'Automobile
| Others |
| SIA | Societe Ivoirienne de l'Automobile
| Others |
| SIA | Society for Industrial Archeology
| Others |
| SIA | Society for International Affairs
| Others |
| SIA | Society of Insurance Accountants
| Others |
| SIA | Society of Investment Analysts
| Others |
| SIA | Software Impact Assessment
| Others |
| SIA | Software Industry Association
| Others |
| SIA | Solar Inertial Attitude
| Others |
| SIA | Solidaridad Internacional Antifascista
| Others |
| SIA | Solvent Interaction Analysis
| Others |
| SIA | Sorry I Apologise
| Others |
| SIA | Sorry I Asked
| Others |
| SIA | Sorry Im Afraid
| Others |
| SIA | Special Instructional Assistance
| Others |
| SIA | Special Interest Aliens
| Others |
| SIA | Special Interest Automobiles
| Others |
| SIA | Spectrophotometric Intracutaneous Analysis
| Others |
| SIA | Speed Indicator and Alarm
| Others |
| SIA | Sperm-Immobilising Activity
| Others |
| SIA | Spinal Injuries Association
| Others |
| SIA | Spirituality In Action
| Others |
| SIA | Sports Injection Automatic
| Others |
| SIA | Sprint Invaders Association
| Others |
| SIA | Staffing Industry Analysts
| Others |
| SIA | Starting Instruction Address
| Others |
| SIA | State Investigation Agency
| Agency, Intelligence Agency, Military, Police |
| SIA | Statics Integrated Assessment
| Others |
| SIA | Station of Initial Assignment
| Others |
| SIA | Stereo Integrated Amplifier
| Others |
| SIA | Strategic Investment Area
| Others |
| SIA | Stress-Induced Analgesia
| Others |
| SIA | Stretch-Induced Arrhythmia
| Others |
| SIA | Strip Immunoblot Assay
| Others |
| SIA | Structured Intermittent Auscultation
| Others |
| SIA | Student Internet Association
| Others |
| SIA | Students Internet Associatation
| Others |
| SIA | Students' Internet Association
| Others |
| SIA | Subacute Infectious Arthritis
| Others |
| SIA | Subaru Isuzu Automotive
| Others |
| SIA | Subaru of Indiana Automotive
| Others |
| SIA | Subintimal angioplasty
| Others |
| SIA | Subject Information Access
| Others |
| SIA | Superman's Insurance Agency
| Others |
| SIA | Survivors of Incest Anonymous
| Others |
| SIA | Swiss Society of Engineers and Architects
| Others |
| SIA | Symantec Intruder Alert
| Others |
| SIA | System Impact Analysis
| Others |
| SIA | Systems Interconnect Architecture
| Others |
| SIA | Xi An, Mainland China
| Others |