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To investigate the knowledge and beliefs regarding the use of intrauterine devices (IUDs) for nulliparous women among Chinese health care providers and assess the potential factors related to their misconceptions and conservative beliefs. A self-administered survey was conducted at 2 Chinese national academic conferences in 2015. The questionnaire data obtained from 103 health care providers were analyzed to examine the providers' knowledge regarding the safety and effectiveness of IUDs and the complications associated with IUD use, as well as their beliefs regarding the suitability of IUDs for nulliparous women. An ordinal logistic regression model was used to evaluate the potential factors related to their beliefs. Misconceptions about the complications associated with IUD use were common among our respondents, and they were least likely to know that IUDs do not increase the risk of developing pelvic inflammatory disease (26/97) or ectopic pregnancy (23/102) (22.5%-26.8%). Only approximately 10% of the providers believed that adolescents (9/94) or unmarried nulliparas (10/95) could be candidates for IUDs. In contrast, they were more likely (37/96, 38.5%) to consider married nulliparous women as appropriate candidates (P <.001). Misconceptions about the complications of IUD use were associated with more conservative beliefs regarding IUD use for nulliparous women (adjusted odds ratio, 1.34; 95% confidence interval, 1.00-1.79). The health care providers' insufficient knowledge regarding IUDs contributed to their outdated and conservative beliefs about the suitability of IUDs for nulliparous women. In addition, the difference in the providers' beliefs regarding IUD use for married and unmarried nulliparous women might reflect the stigma associated with premarital sex in Chinese traditional culture. [ABSTRACT FROM AUTHOR]