There is considerable research indicating that intimate partner violence (IPV) is a particularly detrimental traumatic experience that seriously compromises women’s physical, emotional, social, and mental health (Alexander, 2011; Campbell et al., 2002; Pico-Alfonso et al., 2006). A common reaction to IPV exposure is posttraumatic stress disorder (PTSD; Golding, 1999), which, though categorized singly, has a significantly heterogeneous presentation (Dickstein, Suvak, Litz, & Adler, 2010). Researchers have suggested underlying personality characteristics as potential reasons for differences in the expression of PTSD (Miller, Greif, & Smith, 2003). Specifically, a model with three personality subtypes (i.e., externalizing, internalizing, and simple) has been proposed to explain PTSD heterogeneity (Miller, 2003). The model has been supported by differential patterns of comorbid psychological disorders and sequelae associated with concepts of complex PTSD (Miller & Resick, 2007). The current study tested the PTSD personality subtype model in a sample of women exposed to a range of IPV experiences. When subjected to cluster analysis with three a priori groups, temperament patterns of women with high reports of PTSD symptoms replicated the three personality subtype patterns found in Miller and colleagues’ (Miller et al., 2003; 2004; Miller & Resick, 2007) previous investigations (i.e., an externalizing subtype group characterized by high negative emotionality and low disinhibition, an internalizing subtype group characterized by high negative emotionality and low positive emotionality, and a simple subtype group characterized by mid-range scores across the temperament variables). Differences between these groups and between the women with low PTSD symptoms were found, with women reporting personality patterns consistent with the internalizing and externalizing subtype groups exhibiting higher comorbid personality pathology and psychological difficulties. Implications for personality as a risk or resiliency factor in PTSD, and as an explanation of the heterogeneity of PTSD symptom expressions are discussed as are implications for IPV service providers and the potential inclusion of personality in future psychological diagnostic manuals.