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

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

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

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