Background: Delivery by caesarean section causes discomfort due to surgical scars so that the quality of sleep obtained by postpartum mothers is disturbed. Lavender aromatherapy can provide comfort and relaxation, by giving lavender aromatherapy to postpartum mothers resulting in improved sleep quality in postpartum mothers. Objective: To determine the effect of lavender aromatherapy on sleep quality for postpartum mothers in SC. Methods: This study is a pre-experimental study with a one group pretest-posttest design approach and the study population was all normal postpartum mothers in the postpartum ward of Mataram City Hospital and a sample of 30 people using purposive sampling technique. This study uses a paired t test. Results: The characteristics of postpartum mothers are mostly 20-35 years old, most of them work as housewives (not working), history of SC each is 28 people (93.33%) and parity is mostly multiparous as many as 17 people (56, 66%). The average value of sleep quality before being given the intervention was 36.70. After the intervention, the average value was 56.23%. There is an effect of lavender aromatic therapy on the sleep quality of postpartum mothers before and after being given aromatherapy (p value = 0.000 <0.05). Conclusion: Aromatherapy affects the sleep quality of postpartum SC mothers in Mataram City Hospital in 2019