Serratiopeptidase (EC 3.4.24.40), a proteolytic enzyme, is one of the most promising enzymes being used in biopharmaceutical industry. Mulberry phyllosphere, being an unexplored niche for exploration of protease production, was chosen for the present study. Protease producing bacteria were isolated from the tissues of mulberry plant as well as its rhizospheric soil. Two protease producing bacteria belonging to Serratia genus were found to be potential serratiopeptidase producers. Among them, the endophyte, i.e., Serratia marcescens MES-4 presented 95 Units/mL activity, while the soil isolate i.e., Serratia marcescens MRS-11 presented 156 Units/mL activity.