IBS

IBS most commonly refers to:
 * Irritable bowel syndrome, a disorder of the bowel

IBS may also refer to:

Academia and education

 * Indiana Boys School, a former name of Plainfield Juvenile Correctional Facility
 * Institute for Basic Science, a research institute in Daejeon, South Korea
 * Institute of Bangladesh Studies, a research institute in Rajshahi University
 * International Bilingual School, a former Japanese private school in the Los Angeles area
 * International Biometric Society, an academic statistical association for mathematical and statistical methods in the biosciences
 * International Business School, Budapest, a partnership with Oxford Brookes University based in Hungary dating from 1991
 * International Business School, Germany, a private institution of post-secondary education located in Nuremberg
 * Iowa Braille School
 * International Boys' Schools Coalition

Associations

 * Institute of Professional Sound, formerly Institute of Broadcast Sound, a UK broadcasting professional association
 * Instytut Badań Strukturalnych, the Institute for Structural Research in Warsaw, Poland
 * Intercollegiate Broadcasting System, an organization of non-profit, education-affiliated radio stations
 * International Bible Society, a former name of Biblica, a group that translates and publishes the Bible
 * International Boy Scouts, Troop 1, a historic Boy Scout Group in Japan

Business

 * International Builders' Show, an annual trade show organized by the National Association of Home Builders
 * Iptor Supply Chain Systems, formerly International Business Systems, a supply chain management company
 * Internet Broadcasting, a web design firm focused on broadcast television

Fiction

 * IBS, a satirical news channel on the BBC's programme Broken News
 * International Brotherhood of Stevedores, a dockworkers union in season two of the TV show The Wire

Statistics

 * Integrated Brier score, a statistical rate

Medical

 * Ichthyosis bullosa of Siemens, a genetic skin disorder

Science and technology

 * Ideal Body Size, a component of the figure rating scale
 * 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
 * Intrabeam scattering, a collective effect arising in high-intensity particle beams
 * Ion-beam sputtering, a type of sputter deposition
 * Iron-based superconductor
 * Israel Broadcasting Service, former (1951–1965) name of the Israel Broadcasting Authority

Other uses

 * Isaac Bashevis Singer, a Jewish American novelist
 * Iman Budhi Santosa, an Indonesian poet
 * Industrialised Building System (IBS), a term used in Malaysia for a technique of construction
 * Inflatable Boat, Small