The concept of transitional justice has gained increasing attention in recent years as a means of addressing the human rights violations and atrocities committed during periods of conflict or authoritarian rule. Transitional justice refers to the processes and mechanisms used to address past human rights violations and promote accountability, redress, and reconciliation in societies transitioning from conflict or authoritarian rule to peace and democracy. The paper will address the concept of transitional justice and the diverse international experiences and approaches to implementing it, insights into the challenges and opportunities of implementing transitional justice measures, and mechanisms used, including truth commissions, criminal prosecutions, and reparations, from international law perspectives. The paper will also explore the role of civil society in advancing transitional justice, including the contributions of human rights organizations, victim groups, and community-based initiatives. The paper will analyze the different ways that civil society actors have been involved in transitional justice processes and how their involvement can contribute to greater transparency, legitimacy, and inclusivity. Finally, the paper will reflect on the lessons learned from international experiences in transitional justice and identify potential strategies for advancing the field, and the role of international actors in supporting transitional justice processes in post-conflict Arabic countries, mainly Syria and Yemen.