Atrial fibrillation is a marker for worse outcomes in patients with heart failure and requires careful, individualized management. Anticoagulation and rate control are important. Routine use of antiarrhythmic drug therapy for maintenance of sinus rhythm carries concerns of risk and limited efficacy. Catheter ablation for maintaining sinus rhythm is feasible for some patients, but further studies are needed to define the risks and benefits. A role remains for AV junction ablation and pacing, with consideration of biventricular pacing to prevent dyssynchrony induced by chronic right ventricular pacing. Ongoing trials will continue to define the risks and benefits as these therapies evolve.