Public sector transformation is essential for improving governance, enhancing service delivery, and fostering economic and social development. Development communication plays a crucial role in ensuring that reform initiatives are effectively communicated, widely understood, and actively supported by citizens. This study examines the development communication framework for public sector transformation in Nigeria and the U.S., analyzing their strategies, challenges, and outcomes. Through a comparative analysis, the study highlights key similarities, including the use of digital platforms, media engagement, and public consultations, while also identifying significant differences in institutional frameworks, transparency mechanisms, and citizen participation. The findings reveal that while the U.S. has institutionalized development communication through strong legal frameworks and participatory governance, Nigeria faces challenges related to weak institutional capacity, limited public access to information, and inconsistent communication strategies. The study also explores the impact of governance structures, political culture, and media landscapes on public sector communication, demonstrating how these factors shape policy implementation and public trust. Based on these insights, the study proposes policy and practical recommendations for strengthening communication frameworks in both countries. These include enhancing transparency laws, fostering inclusive communication strategies, leveraging digital governance tools, and promoting media literacy to combat misinformation. Ultimately, the study underscores the need for context-specific, citizen-centric communication approaches to drive effective and sustainable public sector transformation.