We provide evidence that neural representations of ostensibly unrelated social categories become bound together by their overlapping stereotype associations. While viewing faces, multi-voxel representations of gender, race, and emotion categories in the fusiform and orbitofrontal cortices were stereotypically biased and correlated with subjective perceptions. The findings suggest that social-conceptual knowledge can systematically alter the representational structure of social categories at multiple levels of cortical processing, reflecting bias in visual perceptions.