Objective: Sudden sensorineural hearing loss (SSNHL) in pregnancy is rare. It is believed that the changes of hormone levels may increase thrombogenic risk and interrupt cochlear microcirculation, causing the development of sudden deafness in pregnancy. This study aimed to investigate the incidence and to evaluate the risk factors associated with SSNHL during pregnancy. Methods: We enrolled 401,470 Korean women who had delivery between January 1, 2010, and December 31, 2014 including 459 women with SSNHL. And we had undergone a national health screening examination through the National Health Insurance Corporation. Results: We evaluated the risk factors between 459 women with SSNHL in pregnancy and 401,011 without SSNHL. There were no statistically significant differences in the maternal age, parity, method of delivery, and gestational age at delivery. There were no differences in BMI, blood pressure, fasting blood sugar, and cholesterol level between the two groups. After the adjustment of maternal age on multivariate analysis, SSNHL in pregnancy did not increase the risk for gestational hypertension, preterm birth less than 37 weeks gestation, small-for-gestational age, large-for-gestational age, postpartum hemorrhage, placental previa, and placental abruption. Conclusion: SSNHL can occur throughout the pregnancy and is not associated with maternal identified systemic diseases. It also does not increase risks during delivery or adverse perinatal outcome.