Educational inequalities may be derived from differential teacher expectations toward students from different backgrounds. Such expectations may be associated with stereotypical beliefs and attitudes, which guide behavior and judgments. Although ample research is available concerning differential teacher attitudes based on student ethnicity, few studies have considered the effect of the educational level of the parents. The aim of the current study was to investigate teachers' implicit and explicit attitudes toward students with differentially educated parents. Implicit attitudes were measured using an implicit association task (IAT). The first name of the student was used as a proxy for the educational level of parents, whereby we created separate versions for boys and girls. Participants were randomly divided in two groups, whereby the first group completed the IAT-boys version and the other group the IAT-girls version. Explicit attitudes were measured using a questionnaire. Participants indicated positive implicit attitudes toward students with highly educated parents, independent of the gender of the student. Teachers did not express differential explicit beliefs regarding the learning and social behaviors of students based on the educational level of the parents, and their expectations concerning the motivation and ambitions or educational chances of these students were neutral. The dissociation between implicit and explicit attitudes may be an indication of the social sensitivity of the relationship between students' social background and educational achievements and opportunities. Especially implicit attitudes may account for differences in teacher behaviors toward different groups of students and in turn their educational opportunities, and could therefore partly account for consistent findings of educational inequalities based on the social status of families.