Delusions and the Madness of the Masses is the latest book by Lawrie Reznek, a writer whose work is associated with the field of the Philosophy of Psychiatry. Ambitious both in scope and intent, this book is the latest installment in a tradition of works that employ the language of pathology and disorder — normally understood to apply to individuals — to describe whole societies and belief-systems. One is reminded of Freud’s (1969) assertion — which Reznek cites — that religion is mass delusion; of Edgerton’s (1992) characterization of some pre-modern societies as “sick”; of Dawkin’s (2006) polemic against God, belief in which he describes as delusional. While, thus, not original, Reznek’s thesis — that certain subcultures, groups, and sometimes whole communities can be deluded and should be described as such — is arrived at primarily through philosophical argument rather than psychoanalytic insight or a perusal of detailed anthropological data. On the whole, and for reasons discussed below, I do not believe that Reznek has done enough to convincingly advance his thesis.