Changes during pregnancy can trigger disturbances in the comfort of pregnant women. As many as 83.3% of pregnant women experience low back pain and interfere with activities. The impact of the activities of pregnant women if disrupted will affect the health status of pregnant women and the growth and development of the fetus in the womb. One of the discomforts that pregnant women often complain about is low back pain, which can be due to the older gestational age so mothers have difficulty doing activities. This study aims to determine the effect of implementing Pelvic Rocking Exercise (PRE) on low back pain in third-trimester pregnant women at the Mandiri Midwife Rosita Dewi Practice, Cibitung District This type of research is a Quasi-experimental pre-post with a control design, with a total sample of 15 people for the experimental group and 15 people for the control group. This study uses primary data from interviews and filling out questionnaires. The results showed that 29 people (96.7%) were aged 20-35 years and 100% were at 28-30 weeks' gestation. Mothers had high school-university education as many as 22 people (73.3%) and 25 people (83.3%) were multiparous. The results of the analysis used the Mann-Withney test with a p-value of 0.040 <0.05, meaning that Ha is accepted, meaning that there is a significant influence between the implementation of Pelvic Rocking Exercise (PRE) on low back pain in third-trimester pregnant women at the Independent Practice of Midwife Rosita Dewi, Cibitung District. It is hoped that pregnant women can increase their knowledge, especially about how to do pelvic rocking activities and exercises or PRE to increase self-empowerment in dealing with low back pain and make it easier for them to give birth later.