Background: Burn victims frequently experience significant levels of anxiety and poor sleep due to their distinctive physical and psychological situations. Aim: The present study aimed to evaluate the effectiveness of Jacobson's relaxation technique on anxiety and sleep quality in burn patients. Design: A quasi experimental design was used in the present study. Settings: The study was conducted at the Plastic, Reconstructive, and Burn Surgery Center, Mansoura University, Egypt. Subjects: The study comprised a purposive sample of 30 adult burn patients. Tools of data collection: Data were collected using tool I: A structured interview questionnaire; tool II: The State Trait Anxiety Inventory (STAI) and tool III: The Pittsburgh Sleep Quality Index (PSQI). Results: There was a statistical significance difference among total anxiety levels pre and post intervention at P value ≤ 0.05, there was a highly statistically significant difference between total sleep score pre and post intervention and there was a highly statistically significant effect of anxiety degree on sleep quality among burned patients pre and post applying intervention at p value ≤ 0.001. Conclusion: Jacobson's relaxation technique was very effective in reducing anxiety and improving sleep quality in burn patients post implementation of the technique. Recommendation: Jacobson's Relaxation Technique can be used as a complementary adjunct therapy in conjunction with other medical therapies to lessen the severity of these patients' anxiety levels and sleep disorders.