The conflict between South Korea and North Korea is a prolonged conflict since 1945. Many states have involved to reconcile and solve the problem between these two states. Unfortunately, the problem solving is failed until now. However, many of NGOs have involved reconciling South Korea and North Korea. Global Peace Foundation (GPF) is one of international non-governmental organizations (INGOs) concerned on peacebuilding that also tries to solve this problem. This undergraduate thesis will analyze how the effort of Global Peace Foundation in building peace between South Korea and North Korea. In order to describe it, this undergraduate thesis using concept of Peace by Johan Galtung and concept of NGO’s Role by David C. Korten. The data collected in this undergraduate thesis are primary data from GPF’s member as the relevant parties, and secondary data from books, journals, and articles. This research found that GPF build peace between South Korea and North Korea by campaigning the unification of Korea in Korean peninsula and worldwide level.