Abstract: The aim of this study was to quantitatively examine personality traits among preschool children and their correlation with interests. In addition, we also examined whether there is a difference in personality traits with regard to the birth order of children. The participants were 147 children aged 6 to 8 years, from eight kindergartens in Krapina-Zagorje county. Parents estimated their children at home on questionnaires they were given at kindergarten. Parents filled in some general information, the Questionnaire of interests for preschool children and questionnaire which measures personality traits in children: M5-PS23, both versions of the questionnaires are shortened versions. Factor analysis was carried out on the Questionnaire of interest for preschool children and it showed that there are four factors. Differences have not been established in the context of differences in personality traits with regard to the order of birth. There was a statistically significant positive correlation between neuroticism and Factor 2, a factor releted to interest in toys and objects, and playing with the same toys; and a negative statistically significant correlation with Factor 3, factor releted to calling others into the game, spontaneous animal observation and spontaneous phrase repetition. Furthermore, the results indicate that extraversion is positively correlated to Factor 3 and Factor 4, a factor releted to interest in the ball and the toy figurines. Also, there is a statistically significant correlation between Factor 3 and Factor 1, a factor releted to drawing, interest in picture books, also in foreing languages and children's poems and numerals. Finally, the results showed that there are no significant correlations between agreeableness and any factor.