Background: Anosmia can be frustrating for both the patient and physician, with no clear treatment. We prospectively investigated the effects of stellate ganglion block (SGB) in anosmic patients who were unresponsive to conventional steroid therapy. Methods: Thirteen patients with anosmia were treated with SGB. To evaluate the improvement in olfactory function, we evaluated both changes in subjective symptoms and the butanol threshold test. The number of SGB required for improvement in olfactory function was counted. Results: Seven patients (54%) showed improvement of olfactory function with SGB. The average number of SGB for the first response was 7.4 ± 5.9 times. Conclusions: These results suggest that SGB may be a good treatment modality for patients with anosmia unresponsive to steroid therapy. (Korean J Pain 2007; 20: 154�� 157)