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- Oasis mazeTest used in spatial memory research
- ObedienceYielding to instructions from an authority figure
- Object of the mindObject that exists in the imagination
- Object permanenceUnderstanding that objects exist when unobserved
- Object–role modelingProgramming technique
- ObjectificationTreating persons as objects
- Objective self-awarenessSociopsychological theory
- ObjectophiliaSexual or romantic attraction towards objects
- Objet petit aConcept in Lacanian psychoanalysis
- Obligatory Dangerousness CriterionPrinciple in mental health law
- Oblique effectOblique effect is the name given to the relative deficiency in perceptual performance for
- Oblique StrategiesSet of cards intended to promote creativity
- ObliviousnessAspect of cognitive psychology
- Observational learningLearning that occurs through observing the behaviour of others
- Obsessive lovePossessiveness and inability to accept rejection
- Obsessive relational intrusionInvading privacy
- Obstacles to receiving mental health services among African American youthObstacles to receiving mental health services among African American youth have been assoc
- ObstructionismDeliberately delaying or preventing a process or change
- Occupational health psychologyHealth and Safety psychology
- Occupational psychosisUnhealthy biases and behaviors associated with occupations and careers
- Occupational therapy in the management of seasonal affective disorderOccupational therapy is used to manage the issues caused by seasonal affective disorder (S
- October 2021 sexual assault on SEPTA trainAssault observed by passengers, sparking debate on their motivations
- October 2021 Tokyo attack2021 stabbing attacks committed on a train in Tokyo
- Ocular tilt reactionForm of skew deviation
- OculesicsStudy of nonverbal communication via the eyes
- Oddly satisfying videosGenre of internet video clips
- Odile JacobFrench publisher
- Ofer GrosbardIsraeli psychologist (born 1954)
- Office humorHumor within a workplace environment
- Oklahoma City sonic boom tests1964 FAA sonic boom study over Oklahoma City
- Ola RaknesNorwegian psychologist
- Old person smellOdor of elderly humans
- Ole Ivar LovaasNorwegian-American psychologist (1927–2010)
- Oleg Maltsev (psychologist)Ukrainian psychologist
- Olfactory memoryRecollection of odors
- Olfactory reference syndromeFalse belief of emitting pungent body odors
- Olga YeritsidouGreek educational psychologist, psychosocial researcher, analyst and author
- Oliva EspínCuban American clinical psychologist
- Olive WebbNew Zealand psychologist
- Oliver BraddickBritish developmental psychologist (1944–2022)
- Olmstead v. L.C.1999 United States Supreme Court case
- OlogMathematical framework for knowledge representation
- OmnipotenceProperty of possessing maximal power
- Omri GillathIsraeli-American social psychologist
- On Narcissism1914 essay by Sigmund Freud
- On Suicide1967 translation by Paul Friedman
- On the Justice of Roosting ChickensOn the Justice of Roosting Chickens: Reflections on the Consequences of U.S. Imperial Arro
- On the Origin of the "Influencing Machine" in Schizophrenia1919 article in psychoanalysis
- On-again, off-again relationshipType of interpersonal relationship
- Oneiroid syndromeDream-like fantastic delusional state
- OneironauticsConsciously travelling within a dream
- Onesie (jumpsuit)A onesie () is a type of loose-fitting casual jumpsuit in adult sizes made of knit cotton
- Onion modelDiagram of hierarchical relationships
- Online child abuseChild abuse committed online
- Online counselingMedical intervention
- Online disinhibition effectLack of restraint in online interactions
- Online gender-based violenceOnline gender-based violence is targeted harassment and prejudice through technology again
- Ontological securityConcept in sociology
- OnychotillomaniaMedical condition
- Open DialogueAlternative approach for treating psychosis
- Open field (animal test)Experimental animal test
- Open-mindednessReceptiveness to new ideas
- OpenMxOpenMx is an open source program for extended structural equation modeling. It runs as a p
- OpenPsychPublisher of pseudoscientific open-access academic journals
- Operant conditioning chamberLaboratory apparatus used to study animal behavior
- Operational definitionDefining a concept in terms of specific, replicable actions or procedures
- Operational stress injuryOperational stress injury or OSI is a non-clinical, non-medical term referring to a persis
- Operators and Things1958 anonymous book about schizophrenia
- OphidiophobiaFear of snakes
- Opium trade in the Yan'an SovietNorthwestern China had a historical tradition of opium plantation and trade since the Opiu
- OpportunismTaking advantage of circumstances
- Oppression OlympicsCompetitive type of victim mentality
- Optimism biasType of cognitive bias
- Oral debriefingOral debriefing is the interview process of obtaining detailed verbal testimony from indiv
- Oral stageFreudian Psychosexual development
- OralityState of being oral
- Ordinal numerical competenceIn human developmental psychology or non-human primate experiments, ordinal numerical comp
- Organ languagePsychoanalytic theory
- Organic personality disorderMental disorder
- Organizational chartDiagram showing organizational structure
- Organizational commitmentConcept in organizational behavior
- Organizational conflictIntra-organizational discord
- Organizational identificationOrganizational identification (OI) is a term used in management studies and organizational
- Organizational learningAcademic discipline; examines how goal-driven social entities add and create knowledge
- Organizational network analysisOrganizational network analysis (ONA) is a method for studying communication and socio-tec
- Orgastic potencyConcept coined by Austrian psychoanalyst Wilhelm Reich
- OriginalityAspect of created or invented works being new or novel
- Orna GuralnikIsraeli-American psychologist and psychoanalyst
- Orthomolecular psychiatryForm of alternative medicine
- Oscar IchazoBolivian philosopher (1931–2020)
- OsmophobiaFear of or hypersensitivity to odors
- Ospizio, FlorianaPoorhouse in Floriana, Malta
- OsteitisOsteitis is inflammation of bone. More specifically, it can refer to one of the following
- Ostrich effectAttempt made by investors to avoid negative financial information
- Oswald KülpeGerman structural psychologist (1862–1915)
- Othello errorMisinterpretation of stress as a suspicious attitude
- Other and unspecified dissociative disordersMedical condition
- Other and unspecified personality disordersMedical diagnostic category
- OtherkinIndividuals who identify as not entirely human
- OtrovertNeologism for a proposed personality style
- Otto F. KernbergFounder of Transference-Focused Psychotherapy (TFP)
- Otto GrossAustrian psychoanalyst (1877–1920)
- Otto KlinebergCanadian psychologist
- Otto SelzGerman psychologist
- Outcomes paradoxThe outcomes paradox (otherwise known as the "better prognosis hypothesis") is the observa
- Outgroup favoritismExplanation for a set of social behaviors
- Outpatient commitmentLegal power to control behavior of mental health patients while in the community
- Outrage (emotion)Emotion characterized by a combination of surprise, disgust, and anger
- Outrage factorIn public policy, outrage factor is public opposition to a policy that is not based on the
- Outrageous BetrayalBook by Steven Pressman
- OverachievementInstance of individuals who perform better or achieve more success than expected
- OverchoiceDegradation of decision making with too many choices
- Overconfidence effectPersonal cognitive bias
- Overeaters AnonymousTwelve-step program
- Overjustification effectPsychological phenomenon
- OverlearningPracticing newly acquired skills beyond the point of initial mastery
- Ovide F. PomerleauAmerican psychologist (born 1940)
- Ovulatory shift hypothesisHypothesis of female mating behavior
- Ownership (psychology)Psychological feeling of possession
- Oxford Developmental Preschool ProgramEarly childhood education program
- Ozer SchildDanish-Israeli academic administrator
- Ozlem AydukAmerican professor of psychology