People with Autism Spectrum Disorder show an increased risk of experiencing potentially traumatic events, particularly social victimization. However, Autism Spectrum Disorder and Post-Traumatic Stress Disorder co-occurrence was hardly studied. We examined exposure to potentially traumatic life events and PTSD symptoms in adults with Autism Spectrum Disorder vs typical adults. Twenty-five adults with Autism Spectrum Disorder and 25 typical adults were comparable on age and gender. Participants self-reported on potentially traumatic life events of social and non-social nature, and on PTSD symptoms related to their most distressing event. Results showed higher rates of probable-Post-Traumatic Stress Disorder in the Autism Spectrum Disorder group (32%) compared with the typical adults group (4%). Individuals with Autism Spectrum Disorder reported more PTSD symptoms, particularly re-experiencing and hyper-arousal, compared with typical adults, although the latter was elevated only in females with Autism Spectrum Disorder. Participants with Autism Spectrum Disorder, especially females, reported more negative life events, particularly social events, than typical adults. Sixty percent of Autism Spectrum Disorder participants, but only 20% of typical adults, chose a social event as their most distressing event. Individuals with Autism Spectrum Disorder and probable-Post-Traumatic Stress Disorder co-occurrence presented poorer social skills compared with those with Autism Spectrum Disorder alone. Results indicate increased vulnerability of individuals with Autism Spectrum Disorder to trauma and Post-Traumatic Stress Disorder, especially due to social stressors. Females with Autism Spectrum Disorder may be particularly vulnerable to Post-Traumatic Stress Disorder.