Background: Recent decades have been marked by an extensive movement to analyze bias in people’s thinking, especially in gender-related issues. Studies have addressed the question of gender bias in classrooms on different levels—the use of gender in books, learning opportunities determined by students’ gender, or teachers’ gender preferences. Purpose: In this study, we aim to answer the question of whether and under which circumstances the interaction between teacher gender and student gender positively or negatively influences teachers’ evaluations of students’ performance, while controlling for objective measures of students’ performance. For instance, it could be possible that a teacher with the same gender as a student evaluates the stu...