In the last decade, psychological treatment for posttraumatic stress disorder (PTSD) has become available over the Internet. An Internet-based therapy for trauma victims (Interapy) that combines manual-based cognitive behavioral writing therapy with Internet technology has been pioneered. Three randomized controlled studies have shown that Interapy is effective, producing large reductions in symptoms of PTSD. This chapter describes the treatment rationale, presents individual treatment modules, and discusses specific aspects of the online therapeutic relationship. Finally, it presents Ilajnafsy, a culturally adapted version of Interapy for PTSD patients in Iraq.