This chapter explores how effective or not has civil society been in ending armed conflict and building sustaining peace in Kivu provinces via the use of seven civil society’s peacebuilding functions. The findings are drawn from desk research, mainly exploring data from books, journals, reports, and official documents; and the assessment reported here is conducted within civil society’s functions that the literature in this field provides. This chapter contends that CSOs still exert a weak influence in building peace due to various factors that hinder the fulfilment of peacebuilding functions aiming for a sustainable peace.