This chapter describes fetal treatment and, in particular, fetal surgery. Fetal therapy includes any intervention (invasive and/or noninvasive) performed to improve the health of children by intervening before birth to correct or treat a prenatally diagnosed abnormality. These therapies include ultrasound-guided needle procedures (fetal blood sampling, intrauterine blood transfusion, shunts, balloon valvuloplasty or septostomy, and radiofrequency ablation), fetoscopic procedures (posterior urethral valves, photocoagulation, umbilical cord occlusion, tracheal occlusion, and amniotic band release), open fetal surgery (myelomeningocele repair, lobectomy, and teratoma resection), and ex-utero intrapartum treatment. The chapter provides a historical overview of fetal therapy, the importance of a multidisciplinary approach, fetal diagnoses amenable to fetal therapy, and care of the maternal-fetal dyad before, during, and after intervention. It recognizes the critical, complex, and often difficult role nurse specialists fulfill in fetal treatment, acting as both patient advocate and fetal treatment team representative.