| Acronym | Definition |
|---|
| SIAI➣Singularity Institute for Artificial Intelligence |
| SIAI➣Self Identified Audit Issue |
| SIAI➣Societa Idrovolanti Alta Italia (Italian: Seaplane Company of Northern Italy; est. 1915) |
| SIAI➣Society of Investment Analysts in Ireland (est. 1986; Blackrock, County Dublin, Ireland) |
| SIAI➣Sportsman's Insurance Agency, Inc. (est. 1991; Ormond Beach, FL) |
| SIAI➣Shinnihon Integrity Assurance, Inc. (auditing; Japan) |
| SIAI➣Self Insurance Association of Illinois (est. 1985) |