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During everyday social interaction, people constantly make judgments about each other’s behaviour, intentions, and personality. The underlying cognitive processes of these judgments, however, are often unconscious and people are mostly unaware of why they arrive at certain judgments or conclusions. This makes judgments about other people prone to biases and sometimes encourages systematic attribution of negative traits to certain individuals or groups. Furthermore, social biases, such as racial or gender biases, can lead to discrimination or exclusion of individuals. The research articles included in this Collection explore the psychological aspects giving rise to and helping maintain social biases and how these biases affect social interaction. Work from all areas of Psychology is welcomed.