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The current study aims to evaluate the performance of biology teachers at the intermediate stage in Diyala Governorate / Baqubah in light of the hidden curriculum from the perspective of their students during the academic year 2023-2024.The researcher adopted the descriptive survey method and used a questionnaire as the research instrument to measure the effectiveness of teachers' instructional practices from the hidden curriculum perspective.The study sample consisted of (376) male and female first-grade intermediate students from (12) schools, distributed according to demographic variables (gender, school, and academic achievement level).The results revealed that biology teachers practice elements of the hidden curriculum at a moderate level, and that there are statistically significant differences between male and female students' views regarding teachers' performance.The findings also indicated that instructional practices related to values, attitudes, and behaviors ranked first in terms of the influence of the hidden curriculum, followed by practices related to the development of social skills.Based on these results, the researcher presented a number of recommendations directed to biology teachers and educational decision-makers to improve instructional practices in light of the hidden curriculum.