Indonesia, as one of the founding countries of ASEAN, has an important role in building and strengthening diplomatic relations with ASEAN member countries. Indonesia’s diplomatic relations strategy with ASEAN includes several key aspects, such as economic, security, cultural and social cooperation. In the economic aspect, Indonesia actively promotes free trade and investment between ASEAN countries. Through the ASEAN Economic Community (AEC) Agreement, Indonesia seeks to create a single market and production base, which facilitates the movement of goods, services and investment. This program not only improves the domestic economy, but also encourages overall regional economic growth. Indonesia also collaborates in transnational infrastructure projects, such as building a transportation network connecting ASEAN countries. In the security sector, Indonesia focuses on issues such as countering terrorism, cyber security and drug trafficking. Indonesia actively participates in ASEAN security forums, including the ASEAN Regional Forum (ARF) and the East Asia Summit (EAS). In this context, Indonesia promotes a diplomatic approach and cooperation based on mutual respect for state sovereignty, prioritizing dialogue and peaceful problem solving. Cultural cooperation is also one of the pillars of Indonesia’s diplomatic relations with ASEAN countries. Indonesia holds various cultural activities such as the ASEAN Festival, where member countries can show their respective arts and culture. This initiative not only strengthens relations between countries, but also increases cultural understanding among the ASEAN community. Furthermore, Indonesia rolled out various educational programs to support student exchanges and capacity development in ASEAN countries. Programs such as the ASEAN Scholarship and the ASEAN Youth Volunteer Program are a means to facilitate the young generation in building networks and cooperation between countries. Indonesia is also proactive in facing global challenges together with ASEAN countries. The issues of climate change and the COVID-19 pandemic are the main focus in this diplomatic cooperation. Indonesia has proposed various collaborations to address the environmental and health crisis, including a desire to share technology and knowledge. Another important aspect is Indonesia’s participation in formulating foreign policy on a multilateral basis. With support for ASEAN, Indonesia seeks to ensure regional stability and coordination in facing global challenges, including in international forums such as the G20 and APEC. Apart from that, Indonesia’s support in creating a Resilient ASEAN Community cannot be separated from its diplomatic efforts. By establishing close cooperation in the social and humanitarian fields, Indonesia shows its commitment to the welfare of the people in the region. Activities such as disaster relief and poverty reduction programs are in the main spotlight to increase solidarity between countries. By prioritizing an inclusive and collaborative approach, Indonesia’s diplomatic relations strategy with ASEAN countries not only strengthens Indonesia’s position in the region, but also helps create stability and prosperity for all member countries. This shows that diplomacy based on trust and cooperation can bring significant benefits to all parties.