This is the data set reported in the article, Arts-based interventions for people living with dementia: Measuring ‘in the moment’ wellbeing with the Canterbury Wellbeing Scales, Wellcome Open Research (2021). The dataset contains raw data from arts-based programs that were analysed in the study including composite Canterbury Wellbeing Scales (CWS) scores and scores from all five subscales. Also included are the types of venues the interventions took place and the corresponding activity (intervention), whether a carer was present, number of sessions and whether the sessions were co-created. Demographic information including type of dementia and years diagnosed, age and gender are also provided.