As co-production approaches to quality improvement (QI) gain importance in healthcare, hospital leaders and managers are expected to organise and support such efforts. Yet, patient and public involvement (PPI) can be challenging. Hospital organisations, emphasising knowledge and evidence domains, are characterised by operational-professional rather than patient-preference led management. Thus, PPI adds aspects of influence and responsibility that are not clearly defined or understood, with limited knowledge about how it can be orchestrated. This study, therefore, aimed to explore hospital leaders’ and managers’ contextualised experiences of managing QI efforts involving patients, by comparing two European hospitals. The study draws on field observations and qualitative interviews with a total of 21 QI team leaders and hospital managers in a Swedish and a Dutch hospital organisation. The data were subjected to thematic analysis with a critical realist approach. Results define seven themes, or areas, in which mechanisms are at play: (1) patient involvement in hospital QI, and (2) improving outcomes for patients, originating from the strategic view of achieving the hospital vision. Furthermore, (3) societal influence, (4) knowledge and evidence, (5) complexity, (6) individual resources, and (7) cooperation are areas in which mechanisms operate in the process. These areas are equally relevant for both hospitals, yet the mechanisms involved play out differently depending on contextual structure and local means of action.