Objective: This paper aims to present a comprehensive analysis of the impact of government institutions on the attainment of good governance for sustainable development in Nigeria during the Buhari Administration (2015-2023). It focuses on government institutions' statutory functions in relation to good governance, sustainable development policies, and legislative and policy reforms to promote good governance and sustainable development. Theoretical Framework: This study is underpinned by institutional theory, which de-emphasizes self-interest. The establishment and upkeep of governance institutions exemplify an unwavering dedication, irrespective of the outcomes. The theory of institutions elucidates the growth and structural dynamics of public sectors, drawing upon illustrative instances of successful organizations across various nations. Government institutions and state agencies in Nigeria bear the responsibility of executing good governance policies and assessing their impact on sustainable development. Method: The study employed a straightforward sampling strategy to gather data from 101 individuals from 17 government agencies in Nigeria. A questionnaire was employed as a means of data collection. The questionnaire's validation process involved using Lawshe's template, resulting in a content validity ratio (CVR) of 1. Additionally, the reliability of the questionnaire was assessed using the Cronbach alpha technique, yielding a coefficient alpha value of 0.80. The survey was conducted using a method that did not include direct contact with the participants and the data obtained was analyzed by calculating the frequency of responses and expressing them as percentages. Findings: A higher number of participants recognized their legal responsibilities in accordance with good governance. Sustainable development policies were ineffective, limiting their success. From 2015 to 2023, Buhari's policies failed to ensure lasting good governance and development. Statistical significance was established using chi-square statistics, showing a p-value of .000 (p < 0.05). Thus, effective governance duties of government institutions are linked to sustainable development policy success. Corruption, bureaucratic inefficiency, and inefficiency plague institutions seeking excellent governance for sustainable development. Conclusion: Sustainable development requires a balance between effective policies and governance structures. The Federal Republic of Nigeria's constitution requires government institutions to carefully follow their constitutional commitments.