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