Acardiac twinning, also known as the twin-reversed arterial perfusion (TRAP) sequence, is a rare anomaly. Because the normal, or pump twin provides blood supply to the acardiac twin, the normal twin incurs the possible perinatal sequelae such as polyhydramnios, heart failure, hydrops, or preterm delivery, which has been reported to contribute 55% of the perinatal mortality rate. Many techniques for selective abortion or obliteration of blood flow in the acardiac twin have been reported. Of these techniques, radiofrequency ablation is reported as minimally invasive, safe, and effective for selective abortion. We experienced two successful cases of selective acardiac twin abortion by radiofrequency ablation and present these cases with a brief review of the literature.