This study aims to analyze the Linguistic Landscape of the Masjid al-Haram and Al-Masjid an-Nabawi by examining the forms and functions of public signs, language variation, and visual meaning as a communication system supporting the religious activities of Hajj and Umrah pilgrims, particularly those from Indonesia. The study employed a qualitative approach using a descriptive-comparative method. The data consisted of various public signs found in both mosques, including directional signs, information boards, prohibition signs, service notices, digital displays, and other visual signage. Data were collected through field observation, photographic documentation, and document analysis, and were analyzed using the perspectives of Linguistic Landscape, geosemiotics, and multimodality through the stages of data reduction, categorization, interpretation, and comparative analysis. The findings reveal that the Linguistic Landscape of both mosques functions not only as a medium for conveying information but also as a public communication system that facilitates spatial orientation, crowd management, service delivery, and behavioral regulation during worship. Arabic serves as the dominant language representing the religious identity of the sacred spaces, while English functions as the primary international language for global pilgrims. The study also found that Indonesian has been incorporated into several official service signs at Al-Masjid an-Nabawi, whereas its presence on official signs at Masjid al-Haram remains limited. The study concludes that the Linguistic Landscape extends beyond representing multilingualism by serving as a public service instrument that enhances information accessibility for international pilgrims. The novelty of this study lies in proposing the concept of Indonesian as a Religious Guidance Language, which positions Indonesian not merely as a translation language but as a medium for orientation, service, and religious guidance within a multilingual sacred environment.