| Acronym | Definition |
|---|
| SSIA | Social Services Improvement Agency (various locations) |
| SSIA | Shoe Service Institute of America |
| SSIA | Special Savings Incentive Account |
| SSIA | State Systemwide Investment Approach (California) |
| SSIA | Subject Says It All |
| SSIA | Successful Schools In Action (Seattle, Washington) |
| SSIA | Stop Speaking in Acronyms |
| SSIA | Security Seal Industry Association (UK) |
| SSIA | SnowSports Industries America |
| SSIA | Signal Strength Indication of the Acknowledge (frames) |
| SSIA | Single-Stage Implosion Assembled |
| SSIA | So Sorry in Advance |
