Muhadatsah learning is an essential component in developing students’ Arabic speaking competence; however, students often experience difficulties influenced by their local language backgrounds. This study aims to analyze the problems encountered by students in muhadatsah learning and to identify the characteristics of these problems based on students’ local dialects at MAS Al-Manar. This research employed a qualitative approach with a case study design. Data were collected through interviews with students from Javanese, Malay, and Angkola Batak dialect backgrounds, as well as an interview with an Arabic teacher. The data were analyzed through data reduction, data presentation, and conclusion drawing. The findings reveal four main difficulties in muhadatsah learning: pronunciation difficulties, vocabulary retrieval problems, limited speaking fluency, and language anxiety. Furthermore, students’ local dialect backgrounds influenced the characteristics of their Arabic speaking problems. Javanese students experienced stronger pronunciation interference, Malay students showed difficulties in producing certain Arabic sounds and lexical transfer, while Angkola Batak students demonstrated distinctive pronunciation patterns influenced by their dialect features. These findings indicate that local dialects significantly affect students’ Arabic speaking performance. Therefore, Arabic instruction should consider students’ linguistic backgrounds and provide continuous communicative practice to improve muhadatsah competence.
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