The aim was to describe and compare the level of person-centered care climate in residential nursing homes from the perspectives of older people, their relatives, and healthcare staff. Faced with a growing proportion of older people with multimorbidity and dwindling financial resources, a person-centered care environment is described as contributing to the well-being of older people, to the perception of quality of care by relatives, and to the job satisfaction of nursing staff in residential care. The person-centered care approach is created through interpersonal relationships, where the fundamental values are respect and self-determination. Person-centered climate involves the person's experience of feeling welcome, the recognizability of the surroundings, and the experience of hospitality, security, and safety. From a holistic perspective, it is important to consider older people, their relatives, and healthcare staff, and to integrate relatives into the care process. However, the person-centered climate, as perceived by older people, their relatives, and healthcare staff in residential nursing homes, remains insufficiently explored. A descriptive, comparative cross-sectional design was employed. The study population comprised older people (≥65 years) living in 13 publicly or privately managed residential nursing homes, their relatives, and healthcare staff. Person-centered Climate Questionnaires (PCQ) for patients, relatives, and staff respectively were used to describe person-centered care climate. Participant characteristics included health-related quality of life (EQ-5D-5L), and demographic data. Data analysis will be conducted using non-parametric statistical methods. Data collection will be completed in November 2025, and results will be presented at the conference.