UNLABELLED: Cognitive Stimulation Therapy (CST) is a group psychosocial intervention for people with mild-to-moderate dementia. Despite evidence supporting its effectiveness, cost-effectiveness, and cultural adaptation internationally, CST has yet to be implemented in routine practice outside of the UK. This study consisted of multiple phases. In the first phase, we engaged stakeholders to explore the barriers and facilitators to CST implementation in Tanzania. In the second phase, we developed implementation strategies. In the third phase, we tested these strategies in a study of CST in a tertiary hospital in northern Tanzania. The Consolidated Framework for Implementation Research (CFIR) guided the study. We conducted stakeholder engagement with decision-makers, healthcare professionals, people with dementia and their family caregivers ( SUPPLEMENTARY INFORMATION: The online version contains supplementary material available at 10.1007/s43477-024-00142-6.