Introduction: Quality of life is one of the main concerns for cancer patients in palliative care; however, studies on quality of life in these patients are limited. Objective: To determine the factors associated with quality of life in patients with oncological disease in palliative care. Methods: Observational, analytical study in 184 cancer patients treated in a Pain and Palliative Care Unit during 2021. The dependent variable was quality of life; independent variables were age, sex, education level, occupation, oncological diagnosis, disease duration, and stage. Crude (RP) and adjusted (aRP) prevalence ratios were calculated with a 95% confidence level. Results: The median age was 63 years, and 66.3% were female. Factors associated with quality of life were breast cancer (aRP=1.21; 95% CI: 1.07-1.36; p!<0.010), prostate cancer (aRP=1.36; 95% CI: 1.18-1.56; p!<0.010), or mul...