The development of information and communication technology has driven an increase in online buying and selling activities. However, this also raises new issues regarding consumer protection for those who experience losses in these transactions. This research aims to examine the legal protection measures that can be taken by consumers if they are harmed in online purchase transactions through the Bukalapak marketplace. The purpose of this research is to resolve legal issues concerning the protection of consumers who are harmed in online purchase transactions through the Bukalapak marketplace. This research employs a normative empirical method by analyzing applicable laws and regulations as well as empirical data obtained from actual cases that occur in online purchase transactions on Bukalapak. The research results show that online purchase transactions are recognized as valid and accountable electronic transactions based on the Information and Electronic Transactions Law (UU ITE) and the Government Regulation on Electronic System and Transaction Operations (PP PSTE).