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, the tenth month of the year 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
See also
OTC (disambiguation)