Background: Although family caregivers (FCs) play an important role in the care provided to incurable cancer patients in our region, little is known about the burden they experience. Objectives: This study was conducted to determine the prevalence of caregiver burden (CB) among FCs of incurable cancer patients in two Eastern Mediterranean countries and to identify factors that may be associated with significant CB. Methods: The study included 218 FCs, 165 from Egypt and 53 from Saudi Arabia.