One of the most essential physical prerequisites for human survival is sleep. Patients undergoing hemodialysis often experience a lack of sleep, and it is one of the decisive variables in dialysis patients' quality of life. The objective of this study was to assess the effects of inhaling lavender essential oil on sleep quality in hemodialysis patients. A total of 30 patients were enrolled in the before-and-after intervention trial, which took place in a tertiary care hospital's dialysis unit. The study participants were selected using the purposive sampling technique and they received lavender oil inhalation therapy. The sleep quality was measured using the Pittsburgh Sleep Quality Index. The mean age of the participants was 55.11 (SD = 8.45) years. The mean posttherapy Pittsburgh Global Sleep Quality Index score was 8.8 ± 1.89 compared with the pretherapy score of 14.73 ± 1.53. Patients undergoing hemodialysis experienced a substantial improvement in sleep quality (P < .05). Aromatherapy using lavender oil is effective in enhancing sleep quality in hemodialysis patients.