Ethics is an essential component of obstetric ultrasound, an area in which the authors have collaborated for the past 25 years. The authors describe their collaboration. They then present one of the core ethical concepts of obstetric ultrasound: The ethical concept of the fetus as a patient. Next, they present one of the clearest clinical applications of ethics to obstetric ultrasound: Autonomy-enhancing strategies. The authors hope that these two paradigms will convince the reader that ethics is an essential dimension of obstetric ultrasound and stimulate further interest.