This study examined the association between observers' personalities and body size perceptions. In total, 1119 participants from an international sample completed a five-factor personality inventory and the female Photographic Figure Rating Scale (PFRS). Results showed that Openness to Experience was correlated with the idealisation of a heavier body size among women, as well as the perception of a wider range of body sizes as attractive among both women and men. In addition, Agreeableness was associated with the perception of a wider range of body sizes as attractive among men. Personality factors explained only a small proportion of the variance in body size perceptions, although present results were consistent with a previous proposal on the role played by observers' personalities in attractiveness judgements.