This research aims to find out and analyze the influence of the internal control system and internal audit on good corporate governance. The research method used is descriptive quantitative method with an associative approach. The population to be examined in this study were 50 people consisting of top management, internal auditors and employees of PT. Monfori Nusantara. The sample selection uses census sampling so that all populations are sampled. The results of the research partially show that internal control has a positive and significant influence on good corporate governance, internal audit has a positive and significant effect on good corporate governance, transparency has a positive and significant influence on good corporate governance, accountability has a positive and significant impact on good corporate governance. While simultaneously showing that internal control, internal audit, transparency and accountability have a significant joint effect on good corporate governance at PT. Monfori Nusantara.