Effect of different concentrations of Gibberellin was studied on growth of four species of soil fungi namely, Aspergillus oryzae, A. terreus, A. niger and Alternaria alternata. The hormone was applied singly in various concentrations. Increased growth rate and biomass production revealed significant values when treated with dilute solutions of Gibberellin at 15, 30 and 45 mgL^-1 except A. terreus. Fresh weights and dry weight values were observed appreciably high when Aspergillus terreus was treated with 60 mgL^-1 concentration of the hormone solution. The data on fresh and dry biomass revealed that the highest biomass increase was obtained for Alternaria alternata. Fresh biomass of Alternaria alternata showed 75% increase when treated with 45 mgL^-1 concentration of hormone solution in comparison to control, whereas an increase of 77.8% was obtained in the case of dry weight. At 60 mgL^-1,a significant fresh biomass suppression of 16.3% and 7.43% was observed for Alternaria alternata and Aspergillus oryzae, respectively. The highest loss for dry biomass was noticed in Alternaria alternata (33.33%).