The aim of the present study was examining cognitive functions, listening pre-skills and linguistic abilities in monolingual and bilingual children. The research design was causal-comparative. Thirty 6 to 12- year-old bilingual children of Polyglot Center of Iran and thirty 6 to12-year-old monolingual children of Lego Center consisted the statistical population of this study. Purposeful and available sampling method was used in the present study. Language Development Test, Wechsler Nonverbal Intelligence Test and Listening Pre-Skills Test were the tools used in this study. Data were analyzed using multivariate variance analysis. The results showed that there is a significant difference between monolingual and bilingual children in case of cognitive functions, listening pre-skills and linguistic abilities. parents and education officials are recommended to provide comprehensive and various programs to improve cognitive skills needed for language learning.