PURPOSE: The aim of this study was to explore the significant factors that influence quality of life in elderly patients with colorectal cancer. METHODS: A total of 107 patients with colorectal cancer completed the self-reported MD Anderson Symptom Inventory (MDASI-GI), Patient Generated Subjective Global Assessment (PG-SGA), self-care, and Functional Assesment of Illness Therapy-Colorectal (FACT-C). RESULTS: The mean scores were 87.20±19.84 for QOL, 2.80±2.25 for symptom experience, 6.84±0.58 for nutritional status, and 3.81±0.62 for self-care. The highest score was emotional well-being whereas the lowest score was social/family well-being. Factors affecting quality of life were analyzed by hierarchical multiple regression. As a result, self-care (β=.36, p<.001), symptom experience (β=-.34, p<.001), and nutritional status (β=-.25, p=.001) were identified as factors affecting quality of life. The explanation power of this regression model was 52.0% and it was statistically significant (F=23.55, p<.001). CONCLUSION: The quality of life can be improved by evaluating the comprehensive symptoms experienced by the elderly patients after colorectal cancer treatment, helping self-care, and maintaining proper nutritional status.