Tehran University of Medical Sciences Auditory and Vestibular Research 2423-480X 28 1 2018 12 05 36 41 Yones Lotfi Department of Audiology, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran Jamileh Chupani Department of Audiology, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran Mohanna Javanbakht Department of Audiology, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran Enayatollah Bakhshi Department of Biostatistics, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran 2018 08 20 2018 10 07 Background and Aim: In most everyday settings, speech is heard in the presence of competing sounds and speech perception in noise is affected by various factors, including cognitive factors. In this regard, bilingualism is a phenomenon that changes cognitive and behavioral processes as well as the nervous system. This study aimed to evaluate speech perception in noise and compare differences in Kurd-Persian bilinguals versus Persian monolinguals. Methods: This descriptive-analytic study was performed on 92 students with normal hearing, 46 of whom were bilingual Kurd-Persian with a mean (SD) age of 22.73 (1.92) years, and 46 other Persian monolinguals with a mean (SD) age of 22.71 (2.28) years. They were examined by consonant-vowel in noise (CV in noise) test and quick speech in noise (Q-SIN) test. The obtained data were analyzed by SPSS 21. Results: The comparison of the results showed differences in both tests between bilingual and monolingual subjects. In both groups, the reduction of signal-to-noise ratio led to lower scores, but decrease in CV in noise test in bilinguals was less than monolinguals (p < 0.001) and in the Q-SIN test, the drop in bilinguals’ score was more than monolinguals (p = 0.002). Conclusion: Kurd-Persian bilinguals had a better performance in CV in noise test but had a worse performance in Q-SIN test than Persian monolinguals. https://avr.tums.ac.ir/index.php/avr/article/view/742 https://avr.tums.ac.ir/index.php/avr/article/download/742/272