Abstract: Posttraumatic stress disorder (PTSD) and substance use disorders (SUDs) are highly comorbid among U.S. veterans. Although first-line trauma treatments are effective, there are logistical barriers to delivering them alongside SUD treatments in residential care. Written exposure therapy (WET) is an evidence-based PTSD intervention in which clients repeatedly write about their index trauma. There are advantages to using WET to manage PTSD symptoms, including its brief treatment course (i.e., five sessions) and lack of homework assignments, that make it appealing for integration with the busy programming schedule of residential SUD treatment. To evaluate the acceptability and impact of WET in this context, 10 veterans diagnosed with PTSD individually received WET as a part of a quality improvement project at a Veterans Affairs Medical Center Domiciliary Substance Use Disorder program. All 10 veterans completed WET and reported satisfaction with the treatment and its implementation. Preliminary signals of effectiveness were also found for WET treatment based on improvements in veterans' depressive and trauma symptoms that persisted 1 month following their discharge. The brevity and low patient and provider burden of this therapy, relative to other trauma treatments, allowed easy integration into the residential treatment schedule without affecting SUD programming. This treatment's efficiency and promising preliminary outcomes suggest that WET may be useful for integrating into residential SUD treatment for veteran care.