In this issue of Obstetrics and Gynecology Clinics of North America, guest editors Drs. Henry Galan and Patricia Huguelet bring their considerable expertise to the topic of Emergencies in Obstetrics and Gynecology. This issue provides a comprehensive overview of obstetric and gynecologic emergencies, with emphasis on standards of practice and interdisciplinary collaboration. Expert authors discuss how to arrive at a differential diagnosis and how to prevent, manage, and treat an emergency.