The objective of this chapter is to introduce the catheter ablation in children. The special considerations that apply to catheter ablation in children including factors influencing the decision to proceed with ablation, choice of energy source, the success rates of ablation for common arrhythmias and the likely complications with tips to avoid them are discussed in the present chapter. Among the several factors consider before pursuing ablation, safety is the utmost priority. Factors to take into consideration are size, likely arrhythmia mechanism, and the odds of successful ablation, the risk of complications, equipment size, equipment availability, the need for appropriate anesthesia, and the presence of any concomitant structural heart disease. Success rates for pediatric ablations are generally quite good. Success rates for pediatric radiofrequency ablations have been studied with registry data from different eras. Ablations can be performed in the pediatric population with a low incidence of complications.