The aim of the Study : to study the state of bone mineral density (BMD) in patients with chronic obstructive pulmonary disease (COPD). Materials and methods: studied 104 patients with COPD. The study group comprised men with long smoking history. Mean age 61,2 ± 5,7 years. The study of respiratory function was performed on a multi-type installation «Master-Lab/Jaeger». The study of bone mineral density (BMD) of lumbar spine and proximal femur was performed by X-ray absorptiometry at the densitometer «Lunar DPX-NT». The frequency of osteoporosis was assessed in the whole group and separately for each stage of COPD. Results: In the whole group was most impressed by osteoporosis, lumbar spine - in 37,2% of cases, osteoporosis of the femoral neck - in 19,77% of cases. The lowest BMD were observed in patients with stage 4 COPD (p Conclusion: densitometry is an important method of diagnostics of osteoporosis and should be applied in full in COPD patients.