Background: Gestational hypertension is common all over the world, although it is more common in developing nations and it's an unexpected, multi-organ illness that linked to a lot of maternal and fetal illness and mortality. Aim: Assess the effect of Benson relaxation technique on physiological parameters, anxiety and sleep quality among gestational hypertensive women. Design: Quasi experimental study was used. Setting: All obstetrics hospitals in Port Said city. Subjects: Purposive sample of 160 pregnant women with gestational hypertension were randomly divided into two equal groups. Tools of the study: Four tools were used: Structured interviewing questionnaire, a sheet of physiological measures, hospital anxiety scale (HAS) and the Groningen sleep quality scale (GSQS). Results: The difference between before and after the intervention regarding vital signs in the study group was statistically significant (p=0.001), but not statistically significant in comparison to control group. Also, mean score of Benson relaxation technique for anxiety level in study group was 8.475±4.353 compared to 36.500±7.865 in control group, with a statistically significant between them (P =0.000*). Furthermore, mean score of Benson relaxation technique for sleep quality in study group was 4.53 ± 0.46 compared to 8.32 ± 0.38 in control group, with a statistically significant between them (P =0.001*). Conclusion: Benson relaxation can be utilized as an useful strategy to improve in physiological parameters, sleep quality, and decrease anxiety levels in gestational hypertensive women. Recommendation: The Benson relaxation therapy is an effective therapeutic approach for gestational hypertensive women and should included in their nursing care plan.