Oct or OCT may refer to:

• 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

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

• 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, 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

• All pages with titles beginning with Oct
• All pages with titles beginning with OCT
• All pages with titles containing Oct
• OTC (disambiguation)

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