Abstract : The purpose of this study is to explore the risk of developing low back pain among normal body mass index and overweight pregnant women. This study's respondents consisted of 74 pregnant women in Leuwiliang Sub District in Indonesia. Lower back pain was examined using the Oswestry Disability Index for Low Back Pain questionnaire. This parameter has also high testability and takes about 5 minutes for the patient to complete. The questions given by the interviewer consisted of 10 items asking the results were grouped into two categories: low back pain and no low back pain. Body Mass Index was counted from the height and weight, then the results of the height and weight are entered into the formula (BMI = body weight (kg)/height (m2). The results of BMI were divided into 3 categories BMI < 18,5 into less 18,5-23.0 into normal and >23,0 into overweight. Based on the results, pregnant women who had a body mass index in the overweight category experienced more complaints of lower back pain, there are 35 people with a percentage of (94.6%) compared to pregnant women who had a body mass index in the normal there are 2 people with a percentage (5.4%). From calculations using the Chi-Square test, the Odd Ratio (OR) value of the incidence of complaints of low back pain in the body mass index group during pregnancy was 7.4, where pregnant women with a body mass index in the overweight category were 7.4 times more likely to experience complaints of lower back pain than pregnant women with normal body mass index category. Pregnant women with a body mass index in the category of excessive weight have a higher risk of reporting lower back pain, which is statistically significant and represents the group of pregnant women with the highest percentage of a normal body mass index.