Background. Shared decision making (SDM) for patients enrolling in differentiated antiretroviral therapy (DART) is crucial. Empirical evidence is lacking regarding factors promoting or hindering SDM implementation in DART provision in Ethiopia. Hence, this study aimed to explore the barriers and facilitators to implementing SDM for patients enrolled in DART in Northwest Ethiopia. Methods. A qualitative descriptive study using semi-structured interviews among 17 patients and 15 providers at health facilities providing DART service was conducted. The MAXQDA version 20 software was used for inductive coding. Interviews were analyzed using thematic analysis. Results. Ten themes emerged at 4 levels related to SDM in the provision of DART: patient, provider, organizational, and health system. At the patient level, 1) trust in providers (facilitator) and 2) patient’s level of education (barrier) emerged as themes. At the provider level, 3) lack of familiarity with DART models (barrier) and 4) patient-provider relationship (barrier and facilitator) were emerged themes. At the organizational level, 5) workload (barrier) and 6) resources (barrier and facilitator) emerged as themes. At the health system level, 7) availability of DART models (facilitator), 8) not involving providers while initiating DART models (barrier), 9) other providers’ involvement (facilitator), and 10) presence of other implementing partners (barrier) emerged as themes. Conclusions. Numerous barriers and facilitators influence the implementation of SDM in the provision of DART. Based on these findings, the following steps are recommended. Providing access to patient decision aids shall be in place to assist patients in making decisions about their preferred DART models. Health care workers shall be trained, and patients shall be given education to enhance the SDM process. Policy makers and program managers shall consider the resource context (training and size of human resources and convenience of rooms) for the delivery of ART service to have an appropriate implementation of SDM in clinical practice.