Introduction: Evidences indicate that human immuno-deficiency virus (HIV) and diabetes (DM) impact pregnancy outcomes but no experience on the integrated service delivery of HIV, DM and pregnancy care. This study explored the domains and levels of integration among DM, HIV and pregnancy care to prepare a service delivery model in Ethiopia. Methods: A sequential exploratory mixed method and the integration theoretical framework guided the study. An exploratory qualitative phase used focused group discussion, in-depth interview and observation to explore the level of integration and to refine a questionnaire for the quantitative phase. The data were transcribed and coded for theme-based analysis. The descriptive quantitative phase described HIV, DM and pregnancy care services, and determined the burden of DM among HIV patients and the prevalence of pregnancy and pregnancy outcomes. Data was analysed using Epi-info. The findings were triangulated, discussed and interpreted. Results: Seven themes were generated: joint plan, shared budget, monitoring system, structural location, the need of policy guide, the practice of integrated service delivery and suggested integration approaches. A coordinated HIV and pregnancy care services were noted. There was a linkage between diabetes and HIV, and diabetes and pregnancy care. The 1.5% of diabetes among HIV, the low number of pregnancies per a mother in diabetes (1.8) and HIV (1.3); the high adverse pregnancy outcomes among HIV (13.4% abortion, 12.4% low birth weight (LBW), 3.5% pre-term birth, 2.1% congenital malformation) and diabetes (3.2% big baby, 3.2% LBW, 3.1% Cesarean-section); the respective absent and low (16.2%) diabetes screening service at anti-natal and HIV clinics, the absent pregnancy care service for diabetic females justified the development of the tripartite integrated service delivery model of diabetes, HIV and pregnancy care. Conclusions: The model suggests active diabetes screening, evaluation and treatment at HIV and antenatal clinics. It considers the coordination between non-communicable diseases (NCD), HIV and maternal health units. Pregnancy care could be coordinated at HIV and NCD units. Full integration can be practiced between HIV and pregnancy care units. Preparing policy guide, building the capacity of health providers, advocating and piloting the model may be prioritized before the implementation of the model. / Health Studies / D. Litt. et Phil. (Health Studies)