The aim of this study was to evaluate the relationship between body adiposity index (BAI) and pregnancy-induced hypertension (PIH) in third-trimester pregnant women. This study included 126 women in the third trimester of pregnancy. All participants completed anthropometric measurements and ultrasonic testing. The formula of BAI was hip circumference (cm)/height (m)1.5−18. The frequency of PIH were significantly higher in the upper tertile group (31.0%) than in the low tertile group (7.1%) and the middle tertile group (4.8%) (P<0.01). The area under curve values for the accuracy of BAI in identifying PIH were 0.784. The optimal threshold of BAI for identifying PIH was 36.0. The sensitivity was 72.2% and the specificity was 85.1%. BAI was correlated with PIH. The performance of BAI for identifying third-trimester pregnant women with PIH was moderately accurate.