The contribution of Group Analysis to the treatment of organic pathology: variations in Parkinson’s disease The authors reflect upon the contribution that clinical psychology and Group Analysis can give to medicine in the treatment of organic pathology. They propose consideration of the entire system related to the treatment not only that of the relationship between the doctor and patient, but that of the whole system involved, including the places, space and time of the organization itself. The article describes and analyzes an experience with couples in a residential setting for a limited period of time. In each pair, one has Parkinson’s disease, and the other is the caregiver; the group is an important therapeutic factor. The complexity of the residential experience is evaluated, planned and structured as a group engaged in a dialectic relationship. The specificity of the described institutional intervention is not simply to be found in the utilization of the group, but rather in the conception of the same as a system of organizational functioning composed of an assemblage of groups in which both the patients and the operators transit (the patient group, the caregiver group, the couple groupe, the association group). This also includes the relationship between formal and informal groups. Seen as a sort of psychic medication with powerful potential, the group thus becomes the key factor in a socially oriented clinical medicine. Key words: group, limited residency, social medicine.