The purpose of this study is to analyse the content of primary school textbooks in Iran for their cultural values and characteristics, based on the individualism-collectivism dimension. Six primary school Let's Read Persian (LRP) textbooks were assessed using quantitative content analysis using two lists of individualistic and collectivistic values and cognitive tendencies derived from previous literature. The results showed that Iranian LRP textbooks emphasised themes of individualism, such as self-direction, success, and happiness, and manifested individualistic cognitive tendencies, such as focusing on central objects, making dispositional attributions, and expressing positive emotions. The findings suggest that Iranian LRP textbooks tend to teach children to be independent, strong, self-reliant, and unique individuals, rather than interdependent, cooperative, and harmonious members of a group. The implications of these findings for the education system and the cultural identity of Iranian students are discussed.