The 49‐item MMPI PTSD Subscale, developed and validated with Vietnam combat veterans, was administered to validation and cross‐validation samples of Posttraumatic Stress Disorder (PTSD) patients who had experienced non‐military traumatic events and to psychiatric controls (total N = 69). Using a cutting score of 19, derived from the validation sample only, the PTSD subscale correctly classified 87% of all validation subjects and 88% of all cross‐validation subjects. Results strongly support the utility of MMPI assessment of PTSD with civilian trauma victims as one component of a broad assessment strategy.