IBS may stand for:
Academia
- International Business School, Budapest, a partnership with Oxford Brookes University based in Hungary dating from 1991
- International Biometric Society, an academic statistical association for mathematical and statistical methods in the biosciences
- Indiana Boys School, a former name of Plainfield Juvenile Correctional Facility
- Institute of Bangladesh Studies, a research institute in Rajshahi University
Associations
- Institute of Broadcast Sound, a UK broadcasting professional association-now see Institute of Professional Sound
- Intercollegiate Broadcasting System, an organization of non-profit, education-affiliated radio stations (and webcasters)
- International Bible Society, a former name of Biblica, a group that translates and publishes the Bible with the intent of Christian proselytization
- Instytut Badań Strukturalnych, the Institute for Structural Research
- International Boy Scouts, Troop 1, a historic Boy Scout Group in Japan
- International Bank of Settlements, the international central bank of central banks
Business
- Internet Broadcasting, a web design firm focused on broadcast television
- International Builders' Show, an annual trade show organized by the National Association of Home Builders
- International Business Systems, a supply chain management company
Fiction
- IBS, a satirical news channel on the BBC's programme Broken News
- International Brotherhood of Stevedores, a dockworkers union featured in season two of the TV show The Wire
Medical
- Irritable bowel syndrome, a disorder of the bowel
- Ichthyosis bullosa of Siemens, a genetic skin disorder
Science and technology
- Intrabeam scattering, a collective effect arising in high-intensity particle beams
- Ion-beam sputtering, a type of sputter deposition
- Identical by state, a genetic term also known as non-identical by type (NIBT)
- Instruction Based Sampling, an implementation of a hardware performance counter used to collect performance data in a superscalar microprocessor
- Integrated bridge system, a navigation related system on ships
- Ideal body size, a component of the figure rating scale
- Israel Broadcasting Authority (a.k.a. the IBA, f.k.a. the IBS)
- Institute for Basic Science, a South Korean government funded basic science institute
Other uses
- Iman Budhi Santosa, an Indonesian poet
- Industrialised Building System (IBS), a term used in Malaysia for a technique of construction
