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- L'Année psychologiqueAcademic journal
- L2 Syntactic Complexity AnalyzerL2 Syntactical Complexity Analyzer (L2SCA) developed by Xiaofei Lu at the Pennsylvania Sta
- Labels of primary potency"Labels of primary potency" (LoPP) describe the salient and powerful social labels that "a
- Laboratory animal sourcesAnimals used by laboratories for testing purposes are largely supplied by dealers who spec
- Lack (psychoanalysis)Concept that is always related to desire
- Ladan ShamsAmerican psychologist
- Ladislas J. MedunaPsychiatrist and neuropathologist (1896-1964)
- Laius complexPsychoanalytic terminology
- LámhIrish manual communication system
- Lanah SawyerLanah Sawyer was born in New York City about 1776. In 1793, when she was seventeen and wor
- Lance DodesAmerican psychiatrist and psychoanalyst
- Lance RipsAmerican psychologist
- LandarztMedical doctor in a rural area
- Language and spatial cognitionThe question whether the use of language influences spatial cognition is closely related t
- Language and thoughtStudy of how language influences thought
- LapsusInvoluntary mistake made while writing or speaking
- Lara AkninCanadian social psychologist
- Large-group awareness trainingBehaviour modification training carried out in large groups
- Larry HymanLarry M. Hyman (born September 26, 1947, in Los Angeles, California) is Distinguished Prof
- Larry J. SieverAmerican psychiatrist (1947–2021)
- Larry SquireAmerican psychologist
- Latchkey kidChild often left at home with no supervision
- Late talkerToddler with delayed language development
- Latency stageFreudian psychosexual development
- Latent inhibitionPsychology term
- Latent learningSubconscious retention of information without reinforcement
- Lateral violenceViolence within a marginalised community
- Laura Edwards-LeeperAmerican psychologist
- Laura Hernández GuzmánMexican psychologist and researcher
- Laura Jean CameronCanadian human geographer and historian
- Laura JusticeAmerican psychologist
- Laura PerlsGerman-born psychologist (1905–1990
- Lauren AdamsonAmerican developmental psychologist (1948–2021)
- Lauren ResnickAmerican psychologist
- Lauren SlaterAmerican psychologist
- Laurence Irving (physiologist)Laurence Irving (3 May 1895 – 20 November 1979) was a pioneering American scientist in the
- Laurie HelgoeAmerican psychologist and author (born 1960)
- Laverne AntrobusBritish psychologist/author/television presenter (born 1966)
- Law of attraction (New Thought)Pseudoscientific belief
- Law of comparative judgmentThe law of comparative judgment was conceived by L. L. Thurstone. In modern-day terminolog
- Law of effectPsychological principle; champions trial and error as root of learning
- Law of primacy in persuasionPsychological hypothesis
- Law of the instrumentOver-reliance on a familiar tool
- Lawrence HunterLawrence E. Hunter is a Professor and Director of the Center for Computational Pharmacolog
- Lawrence KohlbergAmerican psychologist (1927–1987)
- Lawrence Kohlberg's stages of moral developmentPsychological theory describing the evolution of moral reasoning
- Lawrence LeShanAmerican psychologist (1920–2020)
- Lawrence PazderLawrence Pazder (April 30, 1936 – March 5, 2004) was a Canadian psychiatrist and author. P
- Lawrence WeiskrantzBritish psychologist (1926–2018)
- Layered graph drawingGraph drawing with vertices in horizontal layers
- LDS Family ServicesFamily Services (formerly LDS Family Services) is a private nonprofit corporation owned an
- Le Marteau sans maîtreLe Marteau sans maître (French: ; The Hammer without a Master) is a chamber cantata by Fre
- Lea BaiderProfessor of medical psychology
- Leadership analysisLeadership analysis is the art of breaking down a leader into basic psychological componen
- Leadership DynamicsLeadership Dynamics, also known as Leadership Dynamics Institute (LDI), was a private, for
- Leadership styleMethods of managing people
- Leah GiarratanoAustralian clinical psychologist and author
- LeanIn.OrgLeanIn.Org (also known as Lean In Foundation) is a 501(c)(3) nonprofit organization founde
- Leann BirchAmerican psychologist (1946–2019)
- Learned helplessnessPsychological behavior
- Learned industriousnessBehavioral theory by Robert Eisenberger
- Learned optimismConcept in positive psychology
- LearningProcess of acquiring new knowledge
- Learning by teachingMethod of teaching in which students teach the subject to each other
- Learning communityGroup of people cooperating to achieve academic goals
- Learning cycleHow people learn from experience
- Learning sciencesStudy of how people learn
- Learning stylesTheories that aim to account for differences in individuals' learning
- Learning through playConcept in education and psychology
- Leda CosmidesAmerican psychologist
- Lee CarrollLee Carroll is an American channeller, speaker, and author. Carroll has authored thirteen
- Lee CronbachLee Joseph Cronbach (April 22, 1916 – October 1, 2001) was an American educational psychol
- Lee ShulmanAmerican educational psychologist (1938–2024)
- Leen RyckaertFlemish psychologist and writer
- Legal aspects of workplace bullyingThe law for workplace bullying is given below for each country in detail. Further European
- Legal psychologyPsychological research of the law
- Legality of cannabisLegal status of cannabis worldwide
- Legitimate peripheral participationLegitimate peripheral participation (LPP) describes how newcomers become experienced membe
- Leisure satisfactionPositive emotional state from leisure activities
- Leiter International Performance ScaleIntelligence test
- Lenore E. WalkerAmerican psychologist (born 1942)
- Leon DănăilăRomanian neurosurgeon and former senator
- Leon EisenbergAmerican psychiatrist (1922–2009)
- Léon WurmserAmerican psychoanalyst (1931–2020)
- Leon ŽlebnikSlovenian philosopher, pedagogue, and psychologist
- Leonard AbbedutoAmerican psychologist
- Leonard CarmichaelAmerican educator and psychologist
- Leonardo da Vinci, A Memory of His Childhood1910 work by Sigmund Freud
- Leonore TieferAmerican psychologist (born 1944)
- Léopold SzondiHungarian psychiatrist
- Leopoldo Salazar ViniegraMexican doctor and psychiatrist (1898–1957)
- Lera BoroditskyAmerican cognitive scientist
- LeShawndra PriceAmerican psychologist
- Leslie LeveAmerican psychologist
- Leslie MoreyAmerican psychologist
- Leslie RescorlaUS developmental psychologist (1945 - 2020)
- Letter and spirit of the lawConcepts in the philosophy of law
- Levels of processing modelPsychological model of memory
- Levenson Self-Report Psychopathy ScaleResearch measure of psychopathy
- Levitation (paranormal)Rising of a human body and other objects into the air by mystical means
- Levitation of saintsSaints to whom the ability to fly or levitate has been attributed
- LeviteJewish men descended patrilineally from the Tribe of Levi
- Levite's concubineStory in the Book of Judges
- Lewin's equationHeuristic formula to explain determinants of behavior
- Lewis GoldbergAmerican psychologist (1932–2026)
- Lexa RoséanAmerican writer, dancer and Wiccan
- Lexical decision taskPsycholinguistic procedure
- Lexical hypothesisPersonality traits reflected in language
- LGBTQ psychologyPsychology for LGBTQ people
- LGBTQ rights in JamaicaLesbian, gay, bisexual, transgender, and queer (LGBTQ) people in Jamaica face legal and so
- Liane DaveyPsychologist, author, public speaker, and business strategist
- Liar's dividendPolitical tactic
- Liberation psychologyApproach to psychology
- Licensed behavior analystLicensed behavioral health professional in the United States
- Licensed clinical professional counselorA licensed clinical professional counselor (LCPC) is a professional who has been qualified
- Licensed professional counselorProfessional license
- LieIntentionally false statement made to deceive
- Lie detectionAssessment of statements to reveal deceit
- Lie-to-childrenTeaching a complex subject via simpler models
- Liebowitz Social Anxiety ScaleSocial anxiety assessment tool
- Lier, NorwayLier is a municipality in Buskerud county, Norway. The administrative centre of the munici
- Life course approachTheory for analyzing people's lives
- Life satisfactionWell-being measurement
- Life skillsAbilities for adaptive and positive behavior
- Life-span model of motivationAccording to the Life-span model of motivation the personal goals that individuals set are
- Lifeline FoundationLifeline Foundation is an NGO based in Kolkata, India. It provides telephone counselling t
- LifeRing Secular RecoveryAddiction and recovery organization
- LifespringDefunct American for-profit organization
- Lifestance HealthMental health services provider in the United States
- Lightner WitmerAmerican psychologist
- Likert scalePsychometric measurement scale
- Liking gapPsychological measurement
- LilapsophobiaFear of tornadoes or hurricanes
- Lilith SterninFictional character in the series Cheers and Frasier
- Lilli NielsenDanish psychologist
- LimerenceLove madness or intense infatuation
- Linda B. SmithDevelopmental psychologist
- Linda BartoshukAmerican psychologist (born 1938)
- Linda C. SobellAmerican clinical psychologist
- Linda Collins (psychologist)American quantitative psychologist
- Linda ElderAmerican educational psychologist, author
- Linda GalloAmerican scientist
- Linda GottfredsonAmerican psychologist and writer (born 1947)
- Linda MealeyEvolutionary psychologist and professor
- Linda SkitkaPsychologist
- Linda Waimarie NikoraNew Zealand psychology academic
- Lindauer PsychotherapiewochenConference for psychodynamic psychotherapy
- Lindsay C. MalloyLindsay C. Malloy is an associate professor of forensic psychology at Ontario Tech Univers
- Lindsay McCunnEnvironmental psychologist
- Lionel HawardBritish forensic psychologist (1920–1998)
- Lionel PenroseBritish medical geneticist
- Lior ZorefLior Zoref (born 1970) is an Israeli researcher, author and keynote speaker whose work foc
- Lisa BortolottiItalian-born British philosopher
- Lisa BowlegAmerican social psychologist
- Lisa FeigensonPsychologist
- Lisa Feldman BarrettAmerican psychological scientist and neuroscientist
- Lisa Goodman (psychologist)American psychologist
- Lisa JamesAmerican clinical psychologist and neuroscientist
- Lisa M. BrownAmerican clinical psychologist
- Lisa M. DiamondAmerican psychologist and feminist
- Lisa M. OakesAmerican infant psychologist
- Lisbeth F.K. Holter BrudalNorwegian psychologist (1935–2025)
- Lisbeth PalmeSwedish psychologist and wife of Olof Palme
- Lise AbramsAmerican cognitive psychologist
- Lisztomania1840s fan frenzy for composer Franz Liszt
- Litigation stressLitigation stress refers to negative mental health consequences (psychological stress) ass
- Little Albert experiment20th-century psychology study
- Little EichmannsSmall actions leading to complicity in evil
- Little emperor syndromeChildren's psychology term in China
- Lived experiencePhenomenological concept
- Living apart togetherLiving arrangement for couples
- Living labLab for Innovation and Research
- LjusdalLjusdal (Swedish: ) is a locality and the seat of Ljusdal Municipality, Gävleborg County,
- Lloyd A. JeffressAmerican scientist
- LocuraType of mental disorder
- Locus of controlConcept in psychology
- Logan WrightAmerican psychologist
- Logic TheoristLogic Theorist is a computer program written in 1956 by Allen Newell, Herbert A. Simon, an
- Logic-based therapyType of philosophical counseling
- LogorrheaCommunication disorder
- LogotherapyPsychotherapeutic approach
- LogoVisual thinkingFor human communication, LogoVisual thinking (also LogoVisual technology and LVT) is a pra
- Lola CuddyCanadian psychologist
- LonelinessUnpleasant emotional response to social or physical isolation
- Loneliness epidemicGlobal increase in social isolation
- Long-term memoryProcess of storage and retrieval memory
- Loran NordgrenAmerican behavioral scientist and author
- Loren PankratzAmerican psychologist (born 1940)
- Lorine PruetteAmerican psychologist (1896–1976)
- Lorna WingBritish psychiatrist and autism researcher (1928–2014)
- Lorraine TylerBritish cognitive neuroscientist and researcher
- Loss aversionAspect of decision and prospect theories
- Lost children of FrancoismChildren taken from Republican parents
- Lost in the mall techniqueMemory implantation technique
- Lotte BailynAmerican social psychologist (b. 1930)
- Lou Andreas-SaloméPsychoanalyst and author (1861–1937)
- Loud quittingType of employee disengagement
- Loudun possessions1634 witchcraft trial in Loudun, France
- Louis OrmontAmerican psychologist
- Louis SassAmerican psychologist
- Louis SchlesingerAmerican psychologist
- Louis ZinkinBritish analytical psychologist
- Louise NadeauCanadian psychologist, professor (b. 1947)
- LoveStrong, positive emotional/mental states
- Love addictionProposed disorder of problematic passion & distress
- Love and hate (psychoanalysis)Psychoanalytic concepts
- Love at first sightFalling in long-lasting love on first sight
- Love bombingAttempt to influence others through displays of affection
- Love In, Love OutBook
- Love letterExpression of love in written form
- Love magicType of magic focused on relationships
- Love of ChristElement of Christian belief and theology
- Love of GodConcepts of worship and devotions towards God
- Love of God in ChristianityConcept in Christianity
- Love triangleRomantic relationship involving three people
- Love–hate relationshipFigure of speech
- LovemapThe lovemap is a concept originated by sexologist John Money in his discussions of how peo
- LovesicknessMental state of unfulfilled or unrequited love
- LovestruckBeing lovestruck means having mental and physical symptoms associated with falling in love
- Low arousal approachWithin the study of human behavior, the Low Arousal Approach was developed by Professor An
- Low arousal theoryPsychological theory
- Low frustration toleranceConcept in Rational Emotive Behavioral Therapy
- Low-ballNegotiation technique
- Low-threshold treatment programType of drug rehabilitation program
- Loyalty programMarketing strategy designed to encourage customers to continue to shop at a business
- Luc CiompiSwiss psychotherapist and psychiatrist
- Lucia Albino GilbertAmerican psychologist
- Lucia CapacchioneAmerican psychologist and author (1937–2022)
- Luciano MecacciItalian psychologist
- Lucifer and Prometheus1952 work of psychological literary criticism by R.J. Zwi Werblowsky
- Ludwig BinswangerSwiss psychiatrist
- Ludwig JekelsLudwig Jekels (or Jekeles; August 15, 1867, Lemberg, Austria-Hungary, now Lviv, Ukraine –
- Ludwig KlagesGerman psychologist and philosopher (1872–1956)
- Ludwika KarpińskaPolish psychologist & scholar
- Ludy T. BenjaminAmerican psychologist
- Luella BurosLuella Gubrud Buros (September 10, 1901 – June 22, 1995) was an American painter, sculptor
- Lunacy (Vacating of Seats) Act 1886Act of the Parliament of the United Kingdom
- Lunatic asylumHistorical confinement for mentally ill people
- Luria–Nebraska Neuropsychological BatteryMedical diagnostic method
- Lüscher color testDiscredited psychological test
- LustHuman emotion
- Lust & Wonder2016 memoir by Augusten Burroughs
- Luxury beliefBeliefs held to convey social status
- Lydia BeneckeGerman criminal psychologist (born 1982)
- Lydia GibersonCanadian-born psychiatrist (1899–1994)
- Lydia WhiteCanadian linguist
- Lyn Yvonne AbramsonAmerican clinical psychologist
- Lynette LongAmerican psychologist
- Lynn FuchsEducational psychologist
- Lynn S. LibenDevelopmental psychologist
- Lynn TolerAmerican lawyer and TV judge
- LyssaGreek goddess of madness and rage
- Lyudmila PetranovskayaRussian psychologist