This study aimed to evaluate the relationship between care burden, fatigue, and family functioning among family caregivers of older adults with Alzheimer’s disease (AD). This study adopts a cross-sectional research design, employing an available sampling method. The sample comprises 150 caregivers of elderly individuals diagnosed with AD, recruited from the elderly clinic overseen by the Birjand Welfare Organization. Data collection encompassed the administration of multiple instruments, including a demographics form, Zarit Burden Interview, Piper Fatigue Scale, and APGAR family functioning questionnaires. A total of 150 elderly individuals diagnosed with AD, along with their respective caregivers, were included in this study. The mean score for caregiver burden was 24.24 (SD=10.18), fatigue was 32.73 (SD=22.76), and family functioning was 6.58 (SD=7.37). A negative and significant correlation was observed between caregiver burden and family functioning (r=-0.693, P<0.05). Furthermore, positive and significant correlations were found between caregiver burden and behavioral fatigue (r=0.720, P<0.05), affective fatigue (r=0.674, P<0.05), as well as sensory cognitive fatigue (r=0.484, P<0.05). The association between behavioral fatigue and affective fatigue revealed a positive and significant correlation (r=0.875, P<0.05), as did the correlation between behavioral fatigue and sensory-cognitive fatigue (r=0.488, P<0.05). Additionally, a positive and significant relationship was observed between affective fatigue and sensory-cognitive fatigue (r=0.478, P<0.05). Considering the pronounced relationship between caregiver burden, fatigue, and family functioning, these factors hold utility for researchers and policymakers in the realms of gerontology and intervention planning, serving as pivotal metrics for assessment and intervention design.