Purpose: Despite poor cognitive function in heart failure (HF), few studies have examined cognition and its probable implication in self-care among Korean HF patients. The purposes of this study were (1) to describe cognition in the domains of global, memory, and executive functions, (2) to explore the relationship between cognition and self-care, and (3) to determine the amount of dietary sodium intake among Korean HF patients. Methods: A pilot study was conducted: 7 HF patients (3 men, mean age 68 years) completed face-to-face interviews for neuropsychological tests of cognition and self-care including dietary sodium intake. Results: More than half of the patients had impaired global cognition, memory, or executive function; patients with more severe HF were at higher risk of poor cognitive function. Korean HF patients exhibited poor self-care, with a high dietary sodium intake (5.6 g/day), approximately twice more than the suggested guideline of 2~3 g/day for patients with stable HF. Conclusion: Cognitive dysfunction and inadequate self-care with noncompliance with dietary sodium restriction were evident in Korean HF patients. More studies are warranted that examine the prevalence of cognitive impairment and areas of deficit using neuropsychological tests in a larger sample and that examine how cognition affects self-care and compliance in salt-intake.