The sexual and gender minority (SGM) individuals are those who identify themselves as lesbian, gay, bisexual, transgender or queer and others such as intersex, asexual, pansexual, and nonbinary (LGBTQ+). Recent survey shows that this population are vulnerable to exhibit higher incidence of mental health conditions such as posttraumatic stress disorder (PTSD) as opposed to non-LGBTQ+ colleagues (Kassing, Casanova, Griffin, Wood, & Stepleman, 2021). Therefore, this current cross-sectional survey sought to estimate the proportion of PTSD and its severity among the sexual and gender minority individuals from selected support groups in Kenya. The Posttraumatic Stress Disorder Checklist (PCL-5) was used to collect data from the sample size of 148 participants using purposive sampling technique. Results from the survey showed 66.9% general prevalence of PTSD and that severity of PTSD was found to be dominant among participants aged 18-23 years at 35.8%, female SGM individuals at 47.3%, the unemployed participants at 41.2%, the singles at 45.9% and among the lesbian participants at 45.9%. This current study concluded that the magnitude of psychiatric conditions such as PTSD among LGBTQ+ individuals was high, hence, mental health service providers working among the LGBTQ+ individuals might consider paying more attention to evaluate PTSD symptoms to provide holistic care to this population

Keywords : Prevalence, Posttraumatic Stress Disorder (PTSD), Sexual And Gender Minority (SGM), LGBTQ+.