Background and ObjectivesWe analyzed the associations between ambivalent ageism, burden and positive experiences of care among informal caregivers of older adults (aged ≥60 years), to advance understanding of its role as psychosocial risk or resilience factor for informal caregivers. Design and MethodsData of 433 informal caregivers (≥18 years) of adults with care needs (≥60 years) from the Attitudes towards Informal Caregivers (ATTIC) project was used. The Ambivalent Ageism Scale, Positive Aspects of Care Scale and the Burden Scale for Family Caregivers were used. Linear regression analyses adjusted for context and personal factors were conducted, with age and gender included as moderators in additional tests. ResultsHigh ageism (total score) was significantly associated with a high level of positive aspects of care and burden. Further analyses showed a significant positive association between benevolent ageism and positive aspects of care, while stronger hostile ageism was associated with less positive aspects of care. Hostile ageism was also significantly associated with more burden, while benevolent ageism and burden were not associated. Additional analyses indicated no moderation by gender, but by age. The association between hostile ageism and burden was weaker with caregivers’ higher age. Discussion and ImplicationsWhile hostile ageism and worse caregiver burden were associated, positive care experiences seemed to benefit from benevolent ageism. This highlights the complex associations between ageism and caregivers’ well-being, which need to be taken into account in theory and practice focused on improving the care situation for both caregivers and care recipients.