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Recognition of others’ identity through facial features is essential in human life. Here, we examined how person knowledge may create biases in the perception of others’ facial identity. In three studies, we used a representational similarity analysis approach to examine the representational structure of facial identities across conceptual, perceptual, and visual levels. Results showed that, when a participant believed any two individuals were more similar in terms of their personality, their faces were perceived to be correspondingly more similar (assessed via computer mouse-tracking), even when controlling for faces’ intrinsic visual similarity. Further, participants’ visual representations of faces belonging to individuals believed to have a more similar personality were found to have a greater physical resemblance (assessed via a reverse-correlation task). Together, the findings suggest that the perception of facial identity is driven not only by the processing of facial features but also the person knowledge we have learned about others.