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Background: Sleep bruxism (SB) and obstructive sleep apnea syndrome (OSAS) are two sleep‐related conditions that have been associated with significantly conflicting results in literature. Understanding the prevalence of bruxism among OSA patients is crucial for identifying possible comorbidities and optimising treatment strategies. Objective: This systematic review aimed at analysing the prevalence of SB in OSAS sufferers and understanding the association between the two. Methods: Five online databases were searched for relevant articles in accordance with the PRISMA guidelines for conduction of systematic reviews. Studies reporting the prevalence of bruxism in OSAS patients and diagnosed through clinical assessments or polysomnography were included. Data extraction and quality assessment were performed independently by two reviewers. Methodological quality of the included studies was assessed using Risk of Bias In Non‐randomised Studies of Interventions (ROBINS‐I). Results: A thorough search of literature yielded only two studies were eligible for this review. SB was found to be significantly present in the OSAS group. Despite methodological variations, the majority of studies reported higher rates of bruxism in OSAS patients compared to the general population or control groups. Conclusion: The results of this systematic review point to a significant association between bruxism and obstructive sleep apnea. Further research is required to determine a more precise prevalence rate and investigate the potential therapeutic implications of the bruxism‐OSAS association that uses a standardised assessment techniques and larger sample sizes. [ABSTRACT FROM AUTHOR]