In this issue of Clinics in Perinatology, guest editors Drs. David K. Stevenson and Gary M. Shaw, along with research scientist Ron J. Wong, bring their considerable expertise to the topic of Preterm Birth. Preterm birth is the leading cause of death among children, with one million children dying due to preterm birth before the age of five years. This issue is a key resource for perinatologists who seek to predict and improve outcomes for preterm births, providing actionable clinical information in hopes of reaching the United Nations Sustainable Development Goal to end all preventable deaths of newborns and children aged under five years by 2030.