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This study examines the Islamic theosophical thought in the works and ideas of Nasaruddin Umar, one of Indonesia's intellectual ulama figures with a particular focus on developing Islamic spirituality. Theosophy in Nasaruddin Umar's context is centered on how the understanding of Islamic spirituality can be integrated with contemporary social realities to address the challenges of the times. Umar adapts metaphysical and esoteric concepts from classical thinkers such as Ibn Arabi, reinterpreting them to present a moderate, inclusive, and relevant Islam in the modern context. Nasaruddin Umar’s Islamic theosophical approach emphasizes the revitalization of religious teachings, which he believes can shape a community’s behavior and character to be harmonious, broad-minded, and tolerant of diversity. This study aims to explore Umar's ideas on spirituality as a centripetal force in building a harmonious and peaceful society, while also critiquing and evaluating the role of theosophy in addressing contemporary issues such as radicalism and identity crises in the Muslim community. The findings of this study are expected to contribute to religious studies and enrich discourse on Islamic theosophy as a path toward moderation and the revitalization of religion in Indonesia.