Perineum wound pain in postpartum women to can cause disruption in early initiation breastfeeding (IMD) less than 1 hour, delayed breastfeeding and laziness in mothers to do early mobilization that resulted in disruption of fundes uteri. Lavender aromatherapy is one of the treatment to reduce pain due its bactericidal, analgesic, antidepressant and antispasmodic effects properties when aromatherapy is inhaled. The active substance linalool and linalyl acetate effect as analgesic.The purpose of the research was to determine the effect of lavender aromatherapy to perineum injury pain by post partum women in Public Health Center Kajen I Pekalongan Regency. This research design used quasi-experimental design with control group design approach. Population were post partum mothers with perineum injury level II . The technique of sampling used accidental sampling to take 30 samples. 15 peoples for the treatment group and 15 for the control group. The instrument of data collecting used the Numerical Rating Scales (NRS). Stastistic test used Wilcoxon test and Mann Whitney test.The result of the study showed that there was the effect of lavender aromatherapy to perineum injury pain by post partum mother with p valuee 0,000From the results of this study was expected health workers can can reduce pain perineum postpartum mother and prevent the impact caused from the use of analgesics.