This paper provides an analysis of the models of public administration in government effectiveness in Uganda. The analysis was based on three selected models: The Classical Public Administration model, New Public Management model, and Post-modern model and highlights the lessons learnt in embracing these models. Literatures was drawn from secondary sources that included focus books, Journals, and other internet materials. The paper relied on experts who were public management practioners to qualitatively interpret and analyse salient remarkable issues during adaptation of these approaches in Uganda’s public service regimes. Findings were that each approach had for some time dominated public management in Uganda but with differing success, challenges and lessons learnt. The paper concludes that more concerted efforts should be geared towards theorizing old, contemporary and new terms in public administration so as to gain an in-depth understanding of the causes and consequences of any given subject matter in the field, as well as building new field of enquiries, and help clarifying and directing inquiry into Uganda’s public policy making, governance and ethics among other subjects within public administration.