The study in this research aims to understand what the meaning of good faith used in the application of the Trademark Law, especially related to the cancellation of trademarks in the Directorate General of Intellectual Property Rights and the interpretation of the Supreme Court on the decision of the case Number 968 K/Pdt.Sus- Hki/2016. The type searching used in this research is Normative with Case Approach and Act Methods. The results of this study refers to the lack of clear explanation of good faith in the laws of the brand and for the meaning of good faith in the Directorate General of Intellectual Property Rights is not necessarily the same as the interpretation of judges who usually correlate with the illegal of brand registrants.