Fifteen different fungal strains were isolated from sawdust samples and tested for cellulase production. Out of them one fungal strain namely Aspergillus sp. IICT–F 141 was able to produce maximum cellulase by submerged fermentation. Wheat bran was used as a substrate for the production of cellulolytic enzymes in batch culture using shake flasks. Optimizations of fermentation medium parameters such as wheat bran particle size, concentration, pH, organic and inorganic nitrogen sources were studied to enhance the further production of cellulases. From the present optimization studies organic nitrogen sources and pH have played a major role by enhancing the celluolytic activity from 34.67 to 184.28 and 180.49 IU/ml of CMCase activities respectively. The overall increase in the production was observed to be 5 fold for both CMCase and FPase, when compared to the pre optimized conditions.