Oct

Oct or OCT may refer to:

Biology and medicine

 * Optical coherence tomography, an imaging method
 * Organic cation transport protein, a type of protein
 * Optimal cutting temperature compound, used in histology
 * Oncology clinical trial, a clinical trial in cancer research
 * Oxytocin challenge test, a type of contraction stress test in late stage pregnancy
 * Obsessive compulsive tendencies, a criterion involved in the diagnosis of obsessive-compulsive disorder

Mathematics

 * Octal, abbreviated oct, the base-8 number system
 * Octahedron, sometimes abbreviated oct, a regular polyhedron
 * Odd cycle transversal, a concept in graph theory

Science and technology

 * Octave, symbol: oct., a unit of measurement in electronics
 * Octans, abbreviation: Oct, a constellation
 * Office of the Chief Technologist, a manager at the NASA Institute for Advanced Concepts
 * Optical coherence tomography, an imaging method
 * Olefin conversion technology, a method in industrial chemistry
 * Office Customisation Tool, available in some versions of Microsoft Office 2007

Chinese places and companies

 * Overseas Chinese Town, (narrowly) a theme park or (broadly) an area in Shenzhen
 * OCT Tower, a skyscraper in Overseas Chinese Town
 * Overseas Chinese Town station (OCT Station), a metro station in Shenzhen
 * Overseas Chinese Town Limited, a company
 * OCT Harbour, a retail development in Shenzhen

Other uses

 * Oct., an abbreviation for the month of October
 * Ontario College of Teachers, a professional self-regulatory body
 * Ontario Certified Teacher, a professional designation from the Ontario College of Teachers
 * Orangi Charitable Trust, a Pakistani microfinance organisation
 * Orion correlation theory, a fringe theory in Egyptology
 * Overseas countries and territories, special territories in relation to the European Union
 * Oxford Classical Texts, a book series
 * Oklahoma City Thunder, an American basketball team
 * Octuple scull, an eight-man racing shell found in the sport of rowing