| Abbreviation | Definition |
|---|---|
| IG | Inner Geometry |
| IGAD | International Game Architecture and Design |
| IGAD | International Game Architecture Design |
| IGAF | Institute for Genome Architecture and Function |
| IHG | Incidental Heat Gain |
| IIALC | Indian Institute of Architects Ludhiana Center |
| IIALC | Indian Institute of Architects Ludhiana Centre |
| IIDA | International Interior Design Association |
| IJAC | International Journal of Architectural Computing |
| IJNA | Indonesian Journal of Naval Architecture |
| IKE | International Key Entrance |
| ILAUD | International Laboratory of Architecture and Urban Design |
| ILRT | Integrated Leakage Rate Test |
| IMA | Integrity Management Architecture |
| IMA | Integrity Measurement Architecture |
| IMC | International Mechanical Code |
| IMD | In-Mould Decoration |
| IMLAB | Interdisziplinaeres Modulares Lehrsystem Architektur Bauwesen (German: Interdisciplinary Modular Teaching System Architecture Construction) |
| IMMA | Integrated Mobility Management Architecture |
| IO | Inspection Opening |