Posttraumatic stress disorder (PTSD) occurs at high rates among college students, and there is an urgent need to develop brief and accessible interventions to help these at-risk students achieve academic and career success. This open-trial pilot study tested the feasibility and effectiveness of Written Exposure Therapy (WET; Sloan & Marx, 2019), a brief, five-session exposure-based treatment, when delivered in a real-world Counseling Services Center. Students who met criteria for probable PTSD were assessed at baseline, posttreatment, and 3-month follow-up using self-report assessments of PTSD and depression. Of 28 eligible college students, 22/28 (78.6%) completed at least one treatment session, and of those students, 14/22 (63.6%) completed the full five sessions, 12 of whom completed both the posttreatment assessment and the 3-month follow-up assessment. Data were analyzed using intent-to-treat (N = 22) and per-protocol (n = 12) samples. As hypothesized, in both samples, PTSD symptoms decreased from baseline to posttreatment (η² = .60-.81; very large effects), and these improvements were maintained at the 3-month follow-up. Similar findings were observed with respect to decreases in self-reported depression, but not with respect to decreases in educational impairment or increases in academic self-efficacy. Qualitative data indicated that both students and therapists found the treatment credible and acceptable. These findings offer preliminary support for the utility of WET for PTSD when delivered in a student counseling services center. Suggestions for adapting WET within a student counseling services environment are discussed. (PsycInfo Database Record (c) 2023 APA, all rights reserved).