The aim of our study was to investigate frequencies of alleles and genotypes of Bcl1 GR gene polymorphism and their correlation with prevalence of BA. Study involved 188 patients with BA and 95 healthy individuals. Bcl1 (rs41423247) polymorphism in exon 2 was determined by means of polymerase chain reaction with subsequent RFLP analysis (restriction fragment length polymorphism) by Fleury I. et al. with modifications. Statistical analysis of the results was performed using SPSS-17 program. The results showed statistically significant differences in genotypes distribution of BclI polymorphism of GR gene in the control group and in patients with BA. The frequency of genotypes distribution of Bcl1 polymorphism of GR gene in controls: C/C, C/G, G/G - 0,421/ 0,453/0,126; in patients with bronchial asthma: 0.228/0.426/0.346, respectively (p=0.001). It was found out that G/G-homozygotes have a fivefold higher risk of BA than those homozygous for C/C regardless of gender. We demonstrated that BA risk in females, homozygous for the minor allele, is higher (p=0.016) and men with G/G genotype of Bcl1 GR gene polymorphism have the highest risk of BA. Thus, G/G genotype of Bcl1 polymorphism of the glucocorticoid receptor gene is associated with the development of asthma.