The main purpose of the research is to study the gender dimension in the post-conflict peace processes in the Horn of Africa by investigating the role of gender in peacebuilding with South Sudan as a case study. The broad objective of the study is to investigate the role ge nder play in the post-conflict peace process of South S udan. The specific objectives are : to investigate why lack of gender equality affects post-conflict peace process in South S udan, assess how girls and women can be empowered in promoting decision making in the peace process and how the challenges that impacts South S udan‟s peace process can be addressed . The study through secondary sources of data provides a better understanding of the conflict in South S udan before and after independence. From the specific objectives the study explains how gender dimension in South S udan has not been reflected in the post-conflict peace process hence the cause of instability in the country. In the households and societal matters as well gender dimension has not been given the priority it deserves where it concerns girls and women because of customs and traditions that the country is rooted in or accustoms to. The study also gives a number of challenges that affects both gender dimension and the peace-process in the post-conflict. It as well provides literature reviews where scholarly opinions on conflicts are explained by different scholars and authors. A theoretical framework is a lso explained in the study and the theory used is post-conflict feminism theory which is suitable because it does not require to replace male with female but instead it push for gender equality and equity. A conclusion of the research is given and a number of recommendations to the GoSS, CSOs and the community are explained. The study recommends further research on gender dimension in South Sudan.