The aim of the study was to examine whether the TGF-beta1 T(861-20)-C gene polymorphism might be useful in identifying individuals with increased susceptibility to postmenopausal bone loss within the Turkish women population. T(861-20)-C polymorphism was genotyped in 616 postmenopausal women selected from the Turkish population: 311 postmenopausal osteoporotic women (OP) aged 45-65 years (mean age 58 years) and a control group (CG) of 305 postmenopausal women in the same age range (mean age 53 years) with normal bone mineral density. We have not found any significant differences in the frequency of the individual genotypes between the osteoporotic and control groups. The distribution of the T(861-20)-C genotypes was for Lumbar spine, CC, 74.0% in OP, 75.1% in CG; TC, 24.1% in OP, 23.9% in CG; TT, 1.9% in OP, 1.0% in CG; and for femoral neck, CC, 76.8% in OP, 72.8% in CG; TC, 22.1% in OP, 25.5% in CG; TT 1.1% in OP, 1.7% in CG. T(861-20)-C polymorphism was not found to be associated with bone mineral density in postmenopausal Turkish women. It was argued that this will be a pioneering study for the future research and therapies.