Understanding speech in noisy environments is a challenging task that requires sensory and cognitive functions, including memory and auditory attention. Bilinguals and monolinguals have different scores of these abilities. This study aims to investigate the relationship between these cognitive skills and compare Turkish-Persian bilinguals with Persian monolinguals regarding speech-in-noise scores. 45 Turkish-Persian bilinguals and 45 Persian monolinguals, aged 18-25 (mean age 21.67), with normal hearing, participated in a speech in noise, auditory working memory, and auditory attention tests. The bilingual group performed significantly worse than the monolingual group in the quick speech-in-noise and n-back auditory working memory tests (