Eye movement desensitization and reprocessing (EMDR) is a method of psychological therapy that has been used in treating various types of trauma in different populations. The purpose of this meta-analysis was to collect data on EMDR and see how effective it is in treating trauma. The meta-analysis was conducted by selecting studies that used EMDR and compared clients’ pre-to post-ratings of symptom severity. The weighted mean effect sizes were computed using the standardized mean difference. The weighted average effect sizes were medium to large effects. The results were affected by the type of trauma experienced and the age of those that experienced it. This study shows that EMDR is an effect type on treatment for victims of trauma.