Adult cancer patients (ACPs) in resource-limited settings disproportionately suffer from inadequate pain control despite advancements in pain management. Family caregivers (FCGs) can support optimal pain control for ACPs in these settings if they are knowledgeable and confident about the needed care. However, the status of FCGs' knowledge and self-efficacy (SE) for pain management in developing countries is not well established. Purpose: To assess the FCGs' knowledge and SE levels for pain management among ACPs while at home in a resource-limited setting.