Misdiagnosis of cardiovascular conditions can lead to serious patient harm. This systematic review explored misdiagnosis of heart failure. Based on 10 included studies, the rate of heart failure misdiagnosis ranged from 16.1% (in an inpatient setting) to 68.5% (when general practitioners referred patients to specialists). Included studies found that heart failure is frequently misdiagnosed as chronic obstructive pulmonary disease (COPD).