Background <p>Critical variations often occur between a state’s initial public policy goals and its implementation outcomes. After two decades, the implementation of the free healthcare policy in Uganda has not achieved the desired outcomes, and there is a lack of comprehensive contextual analysis applying implementation science approaches in the identification of barriers and facilitators. This study explores barriers and facilitators to the implementation of the free healthcare policy, drawing on the retrospective experiences of policymakers, policy advocates, policy supporters or influencers, policy implementers, and policy beneficiaries.</p> Methods <p>We employed an exploratory qualitative study design and conducted 27 semi-structured interviews with key informants and 16 focus groups with users. Perspectives on implementation over time were collected by incorporating questions relating to&#xa0;the policy implementation journey from inception to 2023. The Consolidated Framework for Implementation Research guided data analysis to categorize and examine the barriers and facilitators to implementation. Two coders independently coded the data, which were thematically analysed with NVivo.14.</p> Results <p>A total of five main factors were identified, synthesized, and categorized as barriers and facilitators with overlaps, namely: (i) financial resources, (ii) medicines and supply system, (iii) health human resources, (iv) infrastructure and functionality, and (v) equity and the FHP Implementation.</p> Conclusions <p>Findings illustrate that policy implementation gaps are due to&#xa0;limited resources, political will that does not translate into sufficient allocation of funds, and incremental policy shifts that are not driving meaningful improvement in the health system. The findings explain why the free healthcare policy implementation has been unsuccessful and highlight the importance of investing in resources to support meaningful progress towards universal health coverage.</p>