Vitamin D deficiency rickets was detected as the cause in a nine-month-old girl with dilated cardiomyopathy and signs of congestive heart failure. The patient responded to calcium and vitamin D supplementation promptly and left ventricular systolic functions normalized at the 3rd month of treatment. Nutritional rickets must be remembered in etiological assessment of dilated cardiomyopathy among infants living in regions in which nutritional rickets is still common.