The IL-17A rs2275913 AA genotype was associated with a nearly ten-fold increased risk of GDM in both the codominant (p = 0.021, OR 9.89, 95% CI: 1.63–59.92) and recessive models (p = 0.006, OR 9.33, 95% CI: 1.57–55.38). This evidence concerns the gene IL17A and gestational diabetes.