Background: Post-Traumatic Stress Disorder (PTSD) develops following some stressful events. There has been increasing recognition that children who have been exposed to traumatic events like child sexual abuse can develop post-traumatic stress disorder just like adults. Objective: To determine prevalence of PTSD in sexually abused children seen at the Gender Based Violence Recovery Centre at Kenyatta National Hospital. Design: A cross sectional descriptive study. Setting: Gender Based Violence Recovery Centre – Kenyatta National Hospital. Subjects One hundred and forty-nine (n = 149) sexually abused children were recruited in the study.