Objectives: Use of intrauterine devices (IUDs) by US women is low despite their suitability for most women of reproductive age and in a variety of clinical contexts. This study examined obstetrician-gynecologists' practices and opinions about the use of IUDs in adolescents, nulliparous women and other patient groups, as well as for emergency contraception. Design: A survey questionnaire was sent to a computer-generated sample of 3000 fellows who were reflective of the American College of Obstetricians and Gynecologists (College) membership. Results: After exclusions from the 1552 returned surveys (51.7% response rate), 1150 eligible questionnaires were analyzed. Almost all obstetrician-gynecologists (95.8%) reported providing IUDs, but only 66.8% considered nulliparous women, and 43.0% considered adolescents appropriate candidates. Even among obstetrician gynecologists who recalled reading a College publication about IUDs, only 78.0% and 45.0% considered nulliparous women and adolescents appropriate candidates, respectively. Few respondents (16.1%) had recommended the copper IUD as emergency contraception, and only 73.9% agreed that the copper IUD could be used as emergency contraception. A total of 67.3% of respondents agreed that an MD can be inserted immediately after an abortion or miscarriage. Fewer (43.5%) agreed that an RID can be inserted immediately postpartum, and very few provide these services (11.4% and 7.2%, respectively). Staying informed about practice recommendations for long-acting reversible contraception was associated with broader provision of IUDs. Conclusions: Although most obstetrician gynecologists offer IUDs, many exclude appropriate candidates for IUD use, both for emergency contraception and for long-term use, despite evidence-based recommendations. Implications: This study shows that obstetrician gynecologists still do not offer IUDs to appropriate candidates, such as nulliparous women and adolescents, and rarely provide the copper IUD as emergency contraception. (C) 2014 Elsevier Inc. All rights reserved.