Objective: To identify, in caregivers of patients with Alzheimer’s disease (AD) dementia, factors associated with subjective (personal, physical, emotional, and social) and objective (informal caregiver time and costs) caregiver burden. Design: Prospective longitudinal European observational study: post-hoc analysis. Setting: Clinic. Participants: Community-dwelling patients in France and Germany aged ≥ 55 years (n = 969) with probable AD and their informal caregivers.