An over-reliance on donor funding for HIV/AIDS healthcare services remains a concern in Africa. This study, therefore, explores the partnership between the Zimbabwean government and an international non-governmental organisation in delivering HIV/AIDS healthcare services. An interpretivist paradigm and descriptive phenomenological design were used to elicit the opinions, perceptions, and experiences of forty purposively sampled key informants. Thematic analysis was employed using ATLAS.ti version 7.1.4 to analyse the data. The differences in terms of policies, structures, and administrative issues between the partners identified challenges in the implementation of the programme. This was demonstrated through the reversal of the gains attained in prevention, care, and treatment. This raises concerns for increased risk of defaulters, drug resistance, and deaths. Therefore, the partners in this endeavour should negotiate an aligned approach for the efficient delivery of HIV/AIDS healthcare services.