Caregivers play a vital role in providing support to adults with a chronic condition, or cognitive or physical impairment. Low health literacy in caregivers has the potential to impact adequate care provision, and consequently, care recipient health outcomes. The aim of the study was to systematically review literature related to health literacy of caregivers of adult care recipients, and examine its relationship with care recipient, and caregiver, health outcomes. Electronic databases were searched for relevant English-language publications that assessed health literacy in caregivers.