The degummed mulberry silk yarn and dried Acacia nilotica pods were used for the study. The powdered Acacia nilotica (5, 10, 15 and 20g) was soaked overnight in different Material Liquor Ratio (1:20, 1:30 and 1:40) for optimize the dye-concentration and it was extracted by aqueous method. Based on the reflectance and K/S value, 10g dye-concentration, 1:30 Material Liquor Ratio, 30 min extraction-timewere optimised for dye-extraction. The pre treated silk mordanted with different metallic mordants viz., alum (5%, 10%, 15%), stannous (0.5%, 1.0%, 1.5%), Copper and Ferrous (1%, 2%, 3%) in pre, simultaneous and post mordanting methods and dyed in optimized dye concentration in 1:40 Material Liquor Ratio for 30 min. The dyed silk assessed for yarn strength and elongation. Irrespective of mordants, mordant concentration and mordanting methods, pre mordanted dyed silk yarn with alum (15%), stannous (0.5%), copper and ferrous (3%) showed increased K/S value & colour co-ordinates and these mordants were used for mordant combinations. The silk pre mordanted with (15%) alum showed greater strength & elongation than the other samples. The various shades obtained from dyed silkmordanted with different mordants. Thus, natural dyeing of Acacia nilotica pods with silk yarn is unique and new venture for the dyers, painters and fashion designers. Rural folk can take up these activities as a enterprise to sustain their livelihood.