The execution of fiduciary guarantee objects in the event of a debtor in default can be carried out in several ways, one of which is by auction. This study aims to determine and analyze the implementation of the auction in the execution of fiduciary guarantee objects and legal protection for the parties. This study uses the socio-legal method with library research to obtain secondary data related to auctions and field research to obtain primary data with the implementation and legal protection of the parties in the auction of fiduciary guarantees. The concepts and theories used are the concept of auction, fiduciary guarantee, execution, legal protection. The results of the study indicate that the auction of fiduciary guarantee objects is used by creditors in the event that the debtor is in default. Legal protection for the parties is carried out both preventively and repressively.