This study examined the relationship between the experience of various HIV-related events (receiving the diagnosis, receiving treatment, experiencing physical symptoms, self-disclosing HIV positive status, and witnessing HIV-related death) and posttraumatic stress symptoms in a sample of 100 gay men living with HIV. Self-report data revealed that 65% met criteria for having experienced a traumatic event in accordance with the Diagnostic and Statistical Manual of Mental Disorders, 4th edition, Text Revision (DSM-IV-TR) posttraumatic stress disorder (PTSD) criterion A. The experience of shame, humiliation, or guilt during an event was measured but not found to be a significant indicator of having been traumatized. A total of 33% qualified for a PTSD diagnosis. Stepwise multiple regression analysis showed that receiving medical treatment, experiencing physical symptoms, and witnessing HIV-related death were most associated with HIV-related PTSD symptoms. Given that multiple HIV-related events are potentially traumatic, the screening, assessment and treatment for HIV-related PTSD may need to be considered by HIV services.