This research investigates the adaptation of lotus flower ornaments that came from Hindu-Buddhist traditions within the religious architectures (mosques and churches) in Java, Indonesia. The study aims to identify and document the presence and variations of lotus flower ornaments in Islamic and Christian worship spaces and trace their historical development and visual transformation and analyze the cultural and theological reinterpretations that enabled their inter-religious adaptation. This study used a qualitative methodology that combines literature review and field observation at selected architectural sites in Java. The findings showed that lotus ornaments serve not only as decorative elements but also as symbols of purity and spiritual enlightenment. In mosques, they are simplified and stylized, often merged with Islamic calligraphy and geometric forms. In Christian architecture, especially post-20th century, they are adapted into local design style and reinterpreted through Christian symbolism. Overall, the lotus motif acts as a bridge for inter-religious aesthetics, reflecting cultural convergence and respect for Javanese traditions in sacred architecture.