Introduction: Studies found that low sleep quality (SQ) is associated with many factors such as health, quality of life (QOL), work or academic performance and co-curriculum activities. Hence, improvement to maintain SQ to en- hance students’ QOL is important. Approximately 43% of Malaysian were unaware of their sleep problem and how it affects their physical and mental health, especially among the younger generation. The study aims to investigate the association between SQ and QOL among undergraduate students in UTAR Sungai Long Campus. Method: A cross-sectional study among 256 undergraduate students recruited by purposive sampling was conducted. The Pitts- burgh Sleep Quality Index (PSQI) and the World Health Organization Quality of Life Instruments (WHOQOL-BREF) were administered to evaluate SQ and QOL, respectively. Self-reported demographic data were collected with a structured sociodemographic profile. Associations were evaluated using Spearman’s correlation coefficient, Chi- square test and independence t-test. The level of significance was p< 0.05. Result: Results showed more than one half of students had poor SQ (F=137, 53.5%) and poor QOL (F= 159, 62.1%). All seven PSQI components were significantly associated with at least one QOL domain. Sleep disturbances, sleep latency and daytime dysfunction were correlated with all four QOL domains which are physical health, psychological, social relationships, and envi- ronment. Among the sociodemographic variables, only time travelled from place of stay to campus was associated to SQ (p = 0.04). However, there was no significant association between SQ and the selected sociodemographic vari- ables such as gender, working part-time job, and travel distance from place of stay to campus. Conclusion: Overall, the results from this study showed one half of students suffered from poor SQ and QOL. SQ among undergraduate students is vital in developing good QOL.