In this paper, we comprehensively review the characteristics of adult firesetters, and the etiological features of firesetting. In particular, we pay attention to contemporary research available regarding the core traits and psychopathological features required to understand firesetters, and the classificatory systems and etiological theories developed to understand firesetting. This evaluation of contemporary research suggests that clinical knowledge and practice relating to firesetting is extremely underdeveloped relative to other areas of forensicclinical psychology. We conclude that there are very few etiological theories available to guide consulting clinicians in this area, and little information available specifying the exact criminogenic needs associated with firesetters, or how these needs compare to other offender groups. The significant lack of contemporary treatment programs designed to target firesetting behavior is also noted. We conclude by highlighting core areas for future research and treatment progression. Latest available statistics show that around 323,900 intentionally set fires were recorded by US fire departments in 2005 and these fires caused 490 deaths, 9,100 injuries, and created over 1 billion dollars of costs relating to property destruction (Hall, 2007). Given the enormous societal costs associated with intentional firesetting, it is curious that current psychological understanding of this act is relatively underdeveloped, especially when one compares the extant firesetting literature to that relating to violence or sexual offending. The only existing reviews on firesetting behavior have tended either to focus solely upon child and juvenile firesetters (Kolko, 1985), or have approached firesetting from a psychiatric perspective (Blumberg, 1981;Geller, 1987;Geller, 2008;Ritchie & Huff, 1999). Thus, there is a strong need for a psychologically-informed review on firesetting for consulting clinicians and forensic psychologists who work with adult firesetters.Our paper does not intend to provide an exhaustive review of firesetting since to do so would entail numerous historical pieces. However, we do aim to provide a comprehensive and contemporary overview of the diagnostic criteria, etiological features, theory, and treatment relevant to adult firesetting. Our main aim is to provide clinical practitioners with a comprehensive psychological understanding of adult firesetters, paying particular attention to clinical and etiological features, firesetting behavioral specificity, issues of diagnostic criteria relevant to pathological firesetting, and current treatment issues. Based upon this review, we then make some suggestions for future empirical research and evidence-based practice relevant to firesetting. In order to increase the clarity and focus of this review, and unless otherwise stated, we will focus our discussions on firesetting committed by individuals over the age of 18. We will, however, refer to research with juveniles and children where we feel it is appropriate to ...