Aim: Examining the perspectives of formal and informal caregivers and residents on roles, mutual expectations and needs for improvement in the care for residents with (a risk of) dehydration. Design: Qualitative study. Methods: Semi‐structured interviews with 16 care professionals, three residents and three informal caregivers were conducted between October and November 2021. A thematic analysis was performed on the interviews. Results: Three topic summaries contributed to a comprehensive view on the care for residents with (a risk of) dehydration: role content, mutual expectations and needs for improvement. Many overlapping activities were found among care professionals, informal caregivers and allied care staff. While nursing staff and informal caregivers are essential in observing changes in the health status of residents, and medical staff in diagnosing and treating dehydration, the role of residents remains limited. Conflicting expectations emerged regarding, for example, the level of involvement of the resident and communication. Barriers to multidisciplinary collaboration were highlighted, including little structural involvement of allied care staff, limited insight into each other's expertise and poor communication between formal and informal caregivers. Seven areas for improvement emerged: awareness, resident profile, knowledge and expertise, treatment, monitoring and tools, working conditions and multidisciplinary working. Conclusion: In general, many formal and informal caregivers are involved in the care of residents with (a risk of) dehydration. They depend on each other's observations, information and expertise which requires an interprofessional approach with specific attention to adequate prevention. For this, educational interventions focused on hydration care should be a core element in professional development programs of nursing homes and vocational training of future care professionals. Impact: The care for residents with (a risk of) dehydration has multiple points for improvement. To be able to adequately address dehydration, it is essential for formal and informal caregivers and residents to address these barriers in clinical practice. Reporting Method: In writing this manuscript, the EQUATOR guidelines (reporting method SRQR) have been adhered to. Patient or Public Contribution: No patient or public contribution. [ABSTRACT FROM AUTHOR]