This dataverse includes all data collected in the context of the study ‘Well-Being and Psychosocial Support for Undocumented Migrants in the Netherlands’ (December 2021 - September 2023). The first aim of the study was to understand how social and individual factors change the well-being of undocumented migrants in the Netherlands, and how psychosocial support can intervene in these pathways. The second aim of the study was to understand the dependencies of this group, and in particular, how they depend on aid workers. The psychosocial support was offered by the Netherlands Red Cross and Doctors of the World. Three interventions have been studied: Life Skills groups, individual psychological consultations, and METS workshops. The study invited undocumented migrants who took part in these interventions to participate in a (semi-)structured interview. The first sample group consists of 18 participants (2021-2022), and the second sample group of 31 participants (2022-2023).