<![CDATA[Language interference is a linguistic phenomenon commonly encountered in the language learning process in multilingual countries such as Indonesia. This study aims to describe the forms of language interference among PGSD students and examine differences in its patterns based on their senior secondary educational background. A qualitative descriptive approach was employed, with data collected through observation, in-depth interviews, and documentation. Research subjects were determined through purposive sampling from students with SMA, SMK, and MA backgrounds. Data analysis followed the stages of data reduction, data display, and conclusion drawing, reinforced by source and technique triangulation. The findings reveal that interference occurs simultaneously across four levels: phonological, morphological, lexical, and syntactic. Students from MA backgrounds are more susceptible to phonological interference due to the dominance of regional and Arabic languages, SMK graduates tend to experience greater lexical interference owing to habitual use of technical vocabulary, while SMA students are influenced by regional dialects at the syntactic level. These findings imply the necessity of designing Indonesian language instruction that is adaptive and responsive to the diverse linguistic backgrounds of PGSD students from the very first semester of their studies.]]>
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