Existing literature suggests that the pervasive issue of institutional betrayal--the failure to prevent sexual assault or respond supportively when it occurs that exacerbates distressing mental health symptoms--is a factor in one's ability to cope with the trauma of the assault. This study investigated female undergraduate students' experiences of institutional betrayal following a sexual assault to understand how their coping style and psychological wellbeing were affected by their higher educational institution (HEI)'s inability to respond appropriately to their report. A total of 108 participants (N = 108) responded to an online anonymous survey where they reported their depression, anxiety, stress, PTSD symptoms, and perceptions of institutional betrayal. Institutional betrayal was significantly correlated with maladaptive coping styles, avoidant coping styles, PTSD symptoms, depression, anxiety, and stress. Additionally, avoidant coping styles were significantly correlated with PTSD symptoms and negative emotional symptoms. Maladaptive coping styles were also significantly correlated with PTSD symptoms and negative emotional symptoms. No significant correlations were found with adaptive coping styles. Furthermore, institutional betrayal partially mediated the relationships between maladaptive and avoidant coping styles and psychological wellbeing, accounting for 68% and 69% of the variance, respectively. These results suggest that institutional betrayal by HEIs exacerbates harm to survivors. Further research is recommended to include non-female perspectives, a broader age range, and additional factors affecting the campus climate to better understand institutional betrayal, heal those affected by sexual and betrayal trauma, and move towards creating safer campuses. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://www.proquest.com.bibliotheek.ehb.be/en-US/products/dissertations/individuals.shtml.]