The primary goal of this study was to evaluate the major roles of health-related quality of life (HRQOL) in a 5-year lung cancer survival prediction model using machine learning techniques (MLTs). The predictive performances of the models were compared with data from 809 survivors who underwent lung cancer surgery. Each of the modeling technique was applied to two feature sets: feature set 1 included clinical and sociodemographic variables, and feature set 2 added HRQOL factors to the variables from feature set 1. One of each developed prediction model was trained with the decision tree (DT), logistic regression (LR), bagging, random forest (RF), and adaptive boosting (AdaBoost) methods, and then, the best algorithm for modeling was determined. The models' performances were compared using fivefold cross-validation. For feature set 1, there were no significant differences in model accuracies (ranging from 0.647 to 0.713). Among the models in feature set 2, the AdaBoost and RF models outperformed the other prognostic models [area under the curve (AUC) = 0.850, 0.898, 0.981, 0.966, and 0.949 for the DT, LR, bagging, RF and AdaBoost models, respectively] in the test set. Overall, 5-year disease-free lung cancer survival prediction models with MLTs that included HRQOL as well as clinical variables improved predictive performance. Globally, lung cancer has been the most common cancer for several decades 1. Due to advances in early detection and improved treatment strategies 1,2 , lung cancer mortality has decreased worldwide 3 , and Korean age-adjusted lung cancer mortality has decreased by 3.4% annually since 2012 4. With this increase in the number of cancer survivors, it has become important to classify these individuals into precise prognostic groups and provide them with appropriate information for better follow-up planning and personalized self-management. 5 Many lung cancer survivors have reported that they had diverse health difficulties 2,6 , and their health function or symptom burden was more severe than that of others 6. In fact, many recent studies have suggested that patient-reported outcomes (PROs), such as health-related quality of life (HRQOL) or clinical data, can provide clear prognostic information 7,8. In our previous study of disease-free lung cancer survivors 9,10 , we found that several HRQOL variables showed prognostic potential, and thus, HRQOL or lifestyle factors can be used to identify patients who could benefit from a specific intervention. Therefore, we aimed to predict lung cancer survivors' disease-free 5-year survival after primary treatment for lung cancer ended, i.e., the patient survived without any signs or symptoms of that cancer, such as local or regional relapses of the tumor or development of distant metastases, using a combination of sociodemographic, clinical and HRQOL variables.