Introduction: The present study aimed to compare the attachment styles in conduct disorder, dyslexic and normal students. Method: This is a casual comparative research. The statistical community consists of the whole students from third to fifth grades of primary school of Tehran. First, 55 dyslexic and 43 conduct disorder students were chosen randomly according to multiple stage cluster sampling method after participating in identical tests (reading disorder test and Ruter conduct disorder test). Then 60 normal students were chosen purposefully to be compared with dyslexic and conduct disorder students. After sampling, The Randolph attachment disorder questionnaire was performed. Data was analyzed through one-way ANOVA and schefe method. Results: Data analysis through one-way Anova and schefe method indicate that attachment styles among normal, dyslexic and conduct disorder students have significant difference (p > 0.0001). The results show that dyslexic and conduct disorder students have insecure attachment in compare with normal students. Conclusion: Normal students have secure attachment, but dyslexic student have avoidant insecure attachment and conduct disorder students have ambivalent insecure attachment.