Previous research suggests that female students participate less often and less assertively than male students in college classrooms, and that teachers' discriminatory behaviors are partly responsible. Two in-class surveys of college students (N = 1375)-one at a university and one at a small college-assessed perceptions of student-teacher interaction. Factor analysis revealed a number of analytically distinct dimensions of classroom climate: what the class is like in general, what the class is like for the individual student, and what specific positive and negative teacher behaviors affect interaction. Class size affected each of these dimensions. Gender of student was significant only in the college survey, with males participating more, but this gender difference was not due to teachers' discrimination. Female teachers were more likely to create a participatory climate for all students. Creating a better classroom climate for female students creates a better learning environment for all students. © 1990 Plenum Publishing Corporation.