[en] Doppler limited Optogalvanic Spectroscopic technique is employed to study the hyperfine structure of six transitions of ⁹³Nb. An externally stabilized single frequency ring dye laser and a commercial Nb/Ne hollow cathode lamp were used. From the observed well resolved hyperfine components of the spectra the magnetic dipole and the electric quadrupole coupling constants were evaluated. The hyperfine coupling constants for 12 levels are reported in this paper out of which values for four levels are reported for the first time. Our values are compared with the previous data wherever available. (orig.)