This study aims to describe the forms of language errors made by students in writing laboratory reports. The aspects analyzed include spelling errors, punctuation, the use of standard words, ineffective sentences, and scientific language. This study uses a qualitative descriptive method with an error analysis approach. The research data consisted of students' laboratory reports obtained through documentation techniques. The results of the study show that the most dominant errors occur in the use of spelling and ineffective sentences. In addition, the use of non-standard words and inappropriate scientific language was still found. These errors are caused by students' lack of understanding of language rules and the influence of everyday language use in writing scientific papers.
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