| SSIA | S for Stress Induced Analgesia 
| Others |
| SSIA | Safe Schools Improvement Act
| Others |
| SSIA | Sanmore Spy Industries of America
| Others |
| SSIA | Secure Systems and Information Assurance
| Others |
| SSIA | Security Services and Investigators Act
| Others |
| SSIA | Selective Serotonin Inverse Agonists
| Others |
| SSIA | Shoe Service Institute of America
| Others |
| SSIA | Short Sale Information and Advisory
| Others |
| SSIA | Singapore Semiconductor Industry Association
| Others |
| SSIA | So Sorry In Advance
| Others |
| SSIA | Social Services Improvement Agency
| Others |
| SSIA | Somali Studies International Association
| Others |
| SSIA | South Shore Insurance Agency
| Others |
| SSIA | South Suburban Ice Arena
| Others |
| SSIA | South Sudan Independence Army
| Others |
| SSIA | Soviet Scientists Immigration Act of 1992
| Others |
| SSIA | Special Saving Incentive Account
| Others |
| SSIA | Special Savings Incentive Account
| Others |
| SSIA | Special Survivor Indemnity Allowance
| Others |
| SSIA | Stamford Society of Investment Analysts
| Others |
| SSIA | Studies in Security and International Affairs
| Others |
| SSIA | Subject Says It All
| Others |
| SSIA | Successful Schools In Action
| Others |
| SSIA | Super Saving Investment Account
| Others |
| SSIA | Super Shopping In America
| Others |