Researchers have established associations between the stressors of providing informal care and caregiver health risks. Despite the negative consequences, researchers have identified the existence of protective factors that have the potential to buffer or prevent stress. The purpose of this study was to determine the relationship between self-efficacy and stress in adult informal caregivers providing end-of-life care. This cross-sectional, associational study analyzed data from questionnaires completed by adult informal caregivers providing end-of-life care for an adult in North Texas. Questionnaires provided measures of self-efficacy, stress, and caregiver perceived health. Findings indicated caregiver self-efficacy globally had a significant correlation with stress, whereas caregivers' confidence in caring for themselves had a significant negative relationship with perceived stress. Specifically, study findings indicate caregivers with greater confidence in managing demands of caregiving have lower levels of stress, and caregivers with greater confidence in caring for themselves, specifically, have lower levels of perceived stress. Study findings highlight the importance of caregivers' self-care needs. Health care practitioners should recognize and intervene to support caregivers' self-care needs in order to prevent additional, needless health problems in this population.