The diffusion of international human rights norms through the enforcement of international human rights law by courts has been explored by both scholars of international relations and international law. Turkey, which has been a state party to most international human rights treaties despite being a major violator of human rights, is the case in this paper. It examines norm diffusion in the area of women’s rights through court action in a patriarchal culture protected and represented by a deeply patriarchal state and judiciary. By looking at the legal processes, domestic and international, through which the issue of the right of Turkish women to keep their maiden names after marriage has gone, this paper argues that norm diffusion through court action can be triggered even in difficult cases such as changing gendered norms and describes the conditions and mechanisms that make these changes more likely.