The incidence of primary dysmenorrhea in Indonesia amounts to approximately 54.89%, while another 45.11% is secondary dysmenorrhea. 25 out of 35 female students at SMP Patriot Bangsa (Patriot Bangsa Junior High School) experience primary dysmenorrhea when menstruating. One of nonpharmacological treatments for dysmenorrhea is hypnotherapy. Hypnotherapy is an easy, fast, effective, and efficient way to treat dysmenorrhea by reaching the subconcious. This research aimed to identify the effect of hypnotherapy on dysmenorrhea in junior high school students. This research used a pre-experimental method with one group pretest- posttest design. The population of this research was 117 students and 20 students were chosen as sample with purposive sampling technique. Data were collected from respondents using Verbal Descriptor Scale (VDS) instrument. Data were analyzed in two steps, univariate and bivariate with t-dependent test. The results showed that the average value of dysmenorrhea before intervention is 6.5 and after intervention is 1.35. Hypnotherapy was found to have an effect on dysmenorrhea (t=17,596, p-value 0,001). It was suggested to the school that they should conduct nonpharmacological interventions such as hypnotherapy as treatment of dysmennorhea.