Objectives: In this study, we aimed to examine the association between oral health and quality of life among adults at risk of obstructive sleep apnea using raw data from the second year (2023) of the 9th Korea National Health and Nutrition Examination Survey. Methods: We included a total of 1,561 participants in the final analysis. We performed descriptive statistics as well as frequency, general linear model (analysis of variance), and linear regression analyses using SPSS Statistics version 26.0. Results: The quality of life of the patients averaged 0.79±0.00. According to general characteristics, indicating significant differences according to sex, age, household income, education level, smoking, and drinking. We detected significant differences in the quality of life according to oral health related to chewing and speaking discomfort, oral examination history, toothbrushing frequency, toothache history, unmet dental care needs, and subjective oral health status. Factors influencing quality of life comprised sex, age, household income, education level, chewing and speaking discomfort, toothbrushing frequency, toothache history, and unmet dental care needs. Conclusions: Our results confirm a significant association between oral health and quality of life among adults at risk of obstructive sleep apnea and are expected to serve as foundational data for the development of future policies and intervention programs.