Islamic law and business ethics have an important role in creating a fair, transparent and sustainable business environment. One of the main principles contained in both is justice, which is the basis for building relationships of mutual trust between individuals, companies and society. In the perspective of Islamic law, justice is realized through equal distribution of rights, avoidance of injustice such as usury, gharar and maysir, as well as fair treatment of each party involved in the transaction. In addition, Islamic law emphasizes the importance of accountability, fair dispute resolution, and respect for workers' rights. The application of Islamic business ethics in sharia marketing strategies is a crucial element that must be considered by business actors to achieve sustainability and build consumer trust. Islamic business ethics focuses on the principles of justice, transparency and social responsibility, which are in line with sharia values. Although the application of this principle of justice faces challenges, such as differences in understanding, limited resources, and incompatibility with the country's legal system, its application also opens up great opportunities to improve company reputation, strengthen customer loyalty, and create a fairer and more sustainable market. Overall, both Islamic law and business ethics emphasize the importance of the principles of justice to build trust which is the basis of healthy and sustainable relationships in the business world. Applying this principle of justice not only provides benefits for the parties directly involved, but also contributes to the welfare of society as a whole. understanding and applying the principles of justice and responsibility in business, especially in sharia economics. Thus, Islamic business ethics becomes a strong foundation for managing business sustainably and building a just and prosperous society.