| Abbreviation | Definition |
|---|---|
| IOAC | Intelligent Open Architecture Control |
| IOSA | Integrated Overhead SIGINT Architecture |
| IOSDA | Integrated Open Source Design for Architecture |
| IPD | Insulated Patio Door |
| IPMD | Interior Property Management Directive |
| IQA | Intelligent Query Architect |
| IRAC | Institut royal d'architecture du Canada |
| IRAL | Ian Ritchie Architects Ltd |
| ISA | Interface Studio Architects |
| ISA | International Standard Architecture |
| ISAC | Instruction Set Architecture C |
| ISBL | Inverted Short BaseLine |
| ISIS | Intelligent Sensing for Innovative Structures |
| ISPA | International Society for the Philosophy of Architecture |
| ISSAP | Information Systems Security Architecture Professional |
| ITD | Interior Technical Design |
| ITP | Inspection & Testing Program |
| ITRA | Inter Tier Relationship Architecture |
| IUA | International Union of Architects |
| IUAG | Intra Urban Appliance Gallery |