This study examined potential bias with respect to perceived gender and race in pre-service teachers' professional noticing of children's mathematical thinking. The goal of the study was to explore emerging connections between professional noticing and equity concerns in mathematics education and discover the extent to which such noticing may be influenced by a student's race and gender. A sample of 151 preservice teachers participated, and our findings suggest that bias tends to emerge in the interpreting phase of professional noticing; however, such emergence was not statistically significant when compared across the perceived race and gender of the students.