| Abbreviation | Definition |
|---|---|
| IFBA | Insurance fraud Bureau of Australia |
| IHB | Indiana Historical Bureau |
| IJB | Investigative Journalism Bureau |
| IMAB | Independent Mortgage Advice Bureau |
| INCB | Israel National Cyber Bureau |
| INSB | International Naval Surveys Bureau |
| IOS | Immediate Office of the Secretary |
| IPRB | INPA Passport Record Bureau |
| IPRB | International Passport Record Bureau |
| IPRD | Intellectual Property Rights Department |
| IRDB | Integrated Rural Development Board |
| ISB | Imperial Safety Bureau |
| ISB | Imperial Security Bureau |
| ISB | Islamic Speakers Bureau |
| ISBR | Inkoop Service Bureau Rotterdam |
| ISRB | Idaho Service Rating Bureau |
| ISRB | Idaho Surveying and Rating Bureau |
| ISSB | Incest Survivors Speakers' Bureau |
| ITB | Inspection and Testing Bureau |
| IVB | Innovation Visitors Bureau |