| Acronym | Definition |
|---|
| IOB | In Original Box |
| IOB | Instytucji Otoczenia Biznesu (Polish: Business Environment Institutions) |
| IOB | Indian Overseas Bank |
| IOB | Input Output Block |
| IOB | Institute of Biology |
| IOB | Input/Output Block (in FPGA) |
| IOB | Intelligence Oversight Board (part of President's Foreign Intelligence Advisory Board, PFIAB) |
| IOB | Inspectie Ontwikkelingssamenwerking en Beleidsevaluatie (Dutch: Policy and Operations) |
| IOB | International Order Book (London Stock Exchange) |
| IOB | Iranian Oil Bourse |
| IOB | Input/Output Box |
| IOB | Insulin on Board |
| IOB | Institute of Banking (Saudi Arabia) |
| IOB | Institute of Blogging (Oxfordshire, UK) |
| IOB | Impact on Business (corporate management) |
| IOB | Input Output Buffer |
| IOB | Institute of Building (former name of the Chartered Institute of Building) |
| IOB | Inter-Organization Board for Information Systems |
| IOB | Internal Operating Budget |
| IOB | Iron Ore Beneficiation |
| IOB | Interoperability Branch |
| IOB | Installation Operating Budget |
| IOB | Industrial Order of Battle |
| IOB | Impact of Build |
| IOB | Inorganic, Organometallic and Bioinorganic Chemistry |