Background: To the authors’ knowledge, there is limited information regarding the long-term risk of congestive heart failure (CHF) among patients with follicular lymphoma, a prevalent non-Hodgkin lymphoma diagnosis among those aged >65 years, especially within the context of therapeutic exposures and preexisting comorbidities. Methods: Using Surveillance, Epidemiology, and End Results–Medicare data from 1999 through 2013, the authors identified 6109 patients with follicular lymphoma who were diagnosed at age ≥66 years between January 1, 2000 and December 31, 2011, and a frequency-matched Medicare noncancer sample. Subdistribution hazards models assessed risks associated with new-onset CHF through December 31, 2013. Propensity score–matched models examined CHF risk in patients receiving anthracyclines when compared with matched noncancer controls. Results: When compared with matched controls, patients with follicular lymphoma receiving anthracyclines at ages 66 to 75 years had a 1.7-fold (95% confidence interval, 1.4-fold to 2.1-fold) higher risk of new-onset CHF; patients diagnosed at age >75 years did not differ from noncancer controls with regard to CHF risk. Preexisting hypertension was associated with a 1.7-fold and 1.35-fold, respectively, increased hazard of CHF for each age group, independent of anthracycline exposure. Preexisting diabetes was associated with 1.5-fold increased hazard of CHF only in those patients aged 66 to 75 years. Patients with new-onset CHF had a 18% lower 10-year survival compared with those without CHF. Conclusions: Patients with follicular lymphoma who were exposed to anthracyclines between the ages of 66 years and 75 years were found to be at an increased risk of new-onset CHF; preexisting hypertension and diabetes appeared to increase this risk. The findings of the current study support and inform the risk-based follow-up of vulnerable populations.