The legal doctrine of Piercing the Corporate Veil literally means the attitude of the corporate curtain and scientifically means a process of assigning responsibility to the people who are behind the company for the actions of a legal entity. The implementation of the legal doctrine of Piercing the Corporate Veil aims to provide fairness and protection to stakeholders and shareholders who have a relationship with the company because the company is sometimes misused by the people behind the company for the personal gain which harms others. The implementation of the legal doctrine of Piercing the Corporate Veil at Regionally-Owned Enterprises (BUMD) was partially adopted in Law Number 40 of 2007 concerning Limited Corporation and government regulation Number 54 of 2017 concerning Regionally-Owned Enterprises as a consequence of the form of BUMD namely Regional Public Corporations and Regional Companies. The management of BUMD is carried out by organs, namely for Regional Public Corporations consisting of KPM, Supervisory Board and Directors, while for Regional Companies consisting of GMS, Commissioners and Directors. The legal doctrine of Piercing the Corporate Veil in the perspective of the good corporate governance reaffirms the importance of the principles of good faith and prudential to the organs as the people who are behind the companies in managing BUMD. This is urgent because the principles of good faith and prudential are the spirits of the implementation of the good corporate governance.