PURPOSE: Differentiated service delivery (DSD) models for antiretroviral therapy (ART) for HIV aim to increase patient-centeredness, a concept that incorporates patient choice of service delivery options. We explored choice in DSD model enrollment at 42 public sector clinics in Malawi, South Africa, and Zambia. METHODS: From 09/2022-05/2023, we surveyed people receiving HIV treatment to ask if they had a choice about DSD model enrollment and healthcare providers about their practices in offering choice. We estimated risk differences for ART clients' self-reported offer of choice and report risk differences. We thematically analyzed open-ended questions and report key themes. RESULTS: We enrolled 1049 people receiving HIV treatment (Malawi 409, South Africa 362, Zambia 278) and 404 providers (Malawi 110, South Africa 175, Zambia 119). The proportion of study participants indicating that they had been offered a choice ranged from 4% in Malawi to 17% in Zambia to 47% in South Africa. Over 90% of people receiving HIV treatment in all three countries reported that they were happy to be enrolled in their current DSD model. Participants from urban (ARD 0.94 [0.90-0.99]) and medium-volume facilities (2000-4000 ART clients, 0.91 [0.84-0.98]) were slightly less likely to be offered DSD enrollment. Participants in community-based models 1.21 [1.12-1.30] and those satisfied with their current model 1.06 [1.01-1.13] were more likely to be offered a choice. Among providers, 64% in Malawi, 80% in South Africa, and 59% in Zambia said they offered clients the choice to enroll in DSD or remain in conventional care. CONCLUSION: As of 2023, relatively few people receiving HIV treatment in Malawi, South Africa, and Zambia reported being offered a choice about enrolling in a DSD model, despite most providers reporting offering such a choice. The value of patient choice in improving clinical outcomes and satisfaction should be explored further.