Three organic delusions, namely, “persecutory delusions in psychotic disorder following traumatic brain injury (PDFTBI),” “Capgras syndrome, a major form of delusional misidentification syndrome,” and “anosognosia for left hemiplegia or somatoparaphrenia,” are discussed in this chapter. Concerning persecutory delusions in PDFTBI, we underscore the role of the temporal pole lesion that may segregate the function of the amygdala from visual information processed in the temporal lobe. The isolated function of the amygdala is speculated to cause an undiscerning oversensitive response to any incoming emotional stimuli. With regard to Capgras delusion, the most conventional neuropsychological account of “the mirror-image model of prosopagnosia” is reevaluated, and several important critiques are mentioned. Last, we have attempted to provide a novel explanation of anosognosia for left hemiplegia and somatoparaphrenia by refining definitions of “body consciousness” and “body schema” and by taking account of Edelman’s reentry hypothesis for the genesis of consciousness. In the end, it is concluded that ingenious neuropsychological approaches are indispensable for the understanding of organic delusional syndromes.