This article reviews the current literature on known risk factors for recidivistic arson, with a particular focus on factors that could be used to differentiate serial from 'one-off' arson offenders. The relevance of risk factors for general reoffending to recidivistic arson is discussed, including the role of criminal history, mental illness, and sociodemographic factors. The specific roles of offence related affect, cognitions, and the offender's interest in fire are considered, with recommendations for how theories from other areas of forensic psychology, such as the sex offender assessment and treatment literature, might be applied to the issue of deliberate fire-setting. Finally, protective factors are briefly discussed and the need for a structured risk assessment tool for deliberate fire-setters is canvassed. Given that research into risk and recidivism in fire-setting is underdeveloped, suggestions are made throughout the review for the focus of future research into risk factors for serial arson. consider what is known about factors associated with risk of repeat (serial) fire-setting behaviour in adult offenders. For the purposes of discussion, the terms "arson" and "firesetting" will be used interchangeably throughout although it is acknowledged that arson is a legal definition while fire-setting describes the behaviour itself.The issue of differentiating between serial and one-time arsonists has not been well canvassed in the literature. There are inherent difficulties with this distinction oriented around the secretive nature of the offence and the difficulties in detecting and apprehending firesetters. It seems likely that an individual's first fire-related conviction is not likely to be their first fire offence, but we rely on self-report data, with all the limitations this implies, to lend weight to that hypothesis. Nevertheless, some factors have been found to be relevant in differentiating repeat and one-time arsonists. In discussing risk factors it is necessary to consider those issues that relate to likelihood of further fire setting as well as those that specifically concern level of harm caused by the fire (Dickens, Sugarman, Edgar et al., 2009). It is likely that differences in rates may be due to population differences with mentally disordered samples perhaps exhibiting somewhat lower rates as a result of positive response to psychotherapeutic/pharmacological interventions. However, it appears that mental disorder in and of itself is not necessarily predictive of reoffending generally (see Barnett, Richter, et al., 1997). Certainly, at least one review has queried support for the notion of arsonists as dangerous recidivists (Brett, 2004) and, in general, it appears that arsonists will typically commit more than one arson offence, but that previous arson offending is not necessarily prognostic of future arson activity.The literature on repeat fire-setting has been hampered in part by inconsistent definitions of recidivism and contrasting sources of data. Some authors have relied on ...