Stigma and fear of stigma are widespread among Veterans with PTSD and both have pernicious effects on Veterans' well-being and participation in mental health treatment. Internalized stigma is a harmful consequence of societal stigma, and has been associated with decreased hope, self-esteem, personal motivation, morale, self-regard, and persistence regarding illness management among individuals with a range of mental illnesses. Internalized stigma also has negative impacts on the recovery and well-being of Veterans with PTSD specifically, but no evidence-based interventions are currently available to assist Veterans with PTSD in combatting the impact of internalized stigma. Therefore, the purpose of this proposal is to develop and pilot-test an intervention to provide Veterans with PTSD the skills to cope effectively with stigma and to mitigate the internalization of stigmatizing beliefs and stereotypes. To that end, the investigators will modify Ending Self Stigma (ESS), an intervention composed of evidence-based strategies for combating internalized stigma for mental illness developed by the investigators' team, to specifically serve the needs of Veterans with PTSD.