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In this study, we aimed to investigate the relationship between COPD severity, dyspnea degree and health-related quality of life that measures the disease effects on daily life and general well-being. In this prospective study, 251 patients with COPD as defined by ATS criteria were included. After physical examination, pulmonary function test, dyspnea staging done by visual analogue scale (VAS), and the St. George's Respiratory Questionnaire (SGRQ) for assessment of health-related quality of life measurement were applied to all patients. 86.85% of the patients were men and mean age was 65.55±8.82. There were 100 patients (39.8%) in stage 2, 131 patients (52.2%) in stage 3, and 20 patients (8.0%) in stage 4. Mean VAS was 63.6± 13.7 mm. Mean SGRQ scores of subscales, namely, activity, symptom, impact, and total were 58.6+17.2, 57.2±13.9, 42.7+16.6, and 48.9±15.4, respectively. As the disease stage (severity) increased, a significant increase in SGRQ scores (symptom, activity, impact, and total scores) and VAS was observed (p<0.05). Positive correlation between VAS and SGRQ scores was observed (p<0.05). In the COPD stage-free assessment of SGRQ scores with age, there were high SGRQ scores in elderly patients (p<0.05). In conclusion, there was a correlation between quality of life, dyspnea degree and disease severity classified according to pulmonary function tests. As a result, health-related quality of life measurements may be an important indicator to determine the disease severity and dyspnea level.