To capture older people's, informal caregivers' and health professionals' ideas on potential interventions for empowering older people and informal caregivers in transitional care decision-making. A descriptive qualitative design was adopted. The study was conducted between February and May 2022 in the region of Flanders, Belgium, as part of the TRANS-SENIOR consortium's collaborative research. Data were collected using focus groups, including older people, informal caregivers and healthcare professionals involved in any physical relocation of the older person across home, hospital or nursing home settings. Thematic data analysis was performed based on Braun and Clarke's six-step method. A total of 40 people participated in the focus groups. Four main themes were identified, which describe ideas on how to empower older people and informal caregivers in transitional care: Providing clear and timely information, preparing people for what is to come, person-centredness and providing professional and peer support for informal caregivers. Healthcare (professionals) should facilitate older people's and informal caregivers' empowerment in transitional care decision-making by setting them at the core and inception of the decision-making process. While informal caregivers support their loved ones in decision-making processes, they should also be supported and monitored for burdensome issues. Multicomponent, well-planned and personalised interventions are needed to empower older people and informal caregivers in transitional care decision-making. The ideas raised by all stakeholders who participated in this study can inform these interventions. Adhered to consolidated criteria for reporting qualitative research checklist. Organisations advocating for the interests of older people and informal caregivers played a pivotal role in shaping the TRANS SENIOR project. Furthermore, the study benefitted from the collaborative input of AGE Platform Europe, which amplified the voices and representation of older people during the project design phase.