Thisisanopenaccesstitleavailableunderthetermsofa[CCBY-NC-ND4.0International]licence.ItisfreetoreadatOxfordClinicalPsychologyOnlineandofferedasafreePDFdownloadfromOUPandselectedopenaccesslocations.ThetheoryofmentalizingandepistemictrustintroducedbyPeterFonagyandcolleaguesattheAnnaFreudCentrehasbeenanimportantperspectiveonmentalhealthandillness.MentalizingandEpistemicTrustisthefirstcomprehensiveaccountandevaluationofthisperspective.ThebookexplorestwentyprimaryconceptsthatorganizethecontributionsofFonagyandcolleagues:adaptation,aggression,thealienself,culture,disorganizedattachment,epistemictrust,hypermentalizing,reflectivefunction,thePfactor,pretendmode,theprimaryunconscious,psychicequivalence,mentalillness,mentalizing,mentalization-basedtherapy,non-mentalizing,theself,sexuality,thesocialenvironment,andteleologicalmode.Thebiographicalandsocialcontextofthedevelopmentoftheseideasisexamined.Thebookalsospecifiesthecurrentstrengthsandlimitationsofthetheoryofmentalizingandepistemictrust,withattentiontotheimplicationsforbothcliniciansandresearchers.Thisbookwillbeofinteresttohistoriansofthehumansciences,developmentalpsychologists,andcliniciansinterestedintakingabroaderperspectiveonpsychologicaltheoryandconcepts.