Curriculum review and lesson plan papers are a common type of scientific work found in the educational environment. However, in practice, many language errors are still found in these papers. This can lower the quality of the scientific work and hinder reader understanding. This study aims to analyze language errors in curriculum review and lesson plan papers. The research method used in this study is descriptive analysis. Data were obtained from curriculum review and lesson plan papers obtained from students. The results of the study show that there are various types of language errors found in these papers, namely spelling errors and punctuation errors. The most common spelling errors are the writing of words that do not conform to Indonesian language rules. The most common word errors are the use of incorrect capitalization. And the most common punctuation errors are the use of periods that do not conform to language rules.