Civilizational Synergy in Southeast Asia: Comparative Insights on Islamic Development in Indonesia and Brunei Darussalam

Objective: This study aims to analyze strategic frameworks for developing a future-oriented Islamic civilization in two Muslim-majority Southeast Asian countries: Indonesia and Brunei Darussalam. The primary objective is to identify both the supporting and inhibiting factors and to propose constructive and contextually relevant approaches to shaping a competitive, just, and sustainable Islamic civilization. Theoretical framework: The theoretical framework of this study draws from the concepts of Islamic civilization (ḥaḍārah Islāmiyyah), maqāṣid al-sharīʿah, and sociopolitical integration in Islamic governance. Literature review: The literature review includes works on Islamic renewal, moderate Islam (Islam wasathi), and Southeast Asian Islamic thought, highlighting prior research on Indonesia’s pluralistic religious landscape and Brunei’s state-centric Islamic model. Methods: This research employs a qualitative-descriptive method with a library research approach and comparative analysis. Data were collected from official government documents, scholarly journals, authoritative books, and international reports. Thematic analysis was applied to compare the socio-political and religious dynamics of Islamic civilization development in Indonesia and Brunei Darussalam. Result: Findings indicate that Indonesia demonstrates strengths in pluralism and civil society participation through mass organizations such as Nahdlatul Ulama and Muhammadiyah, promoting moderate and inclusive Islamic values. In contrast, Brunei exemplifies a centralized model of Islamic governance rooted in the Malay Islamic Monarchy (MIB) ideology, ensuring consistency in state-Islam integration. Both countries share common challenges including radicalism, weakened youth identity, and the pressures of global secular trends. Implications: The study’s implications highlight the need for regional collaboration in Islamic education and Shariah-based economic initiatives. Novelty: The novelty of this research lies in its strategic formulation of a civilizational framework that combines spiritual, structural, and technological dimensions, rooted in moderate Islamic values. This integrated model serves as a roadmap for sustainable Islamic civilization in the modern world.