The oil and gas industry consumes large amount of cement and additives as cement slurry modifiers for its cementing operations. These cements and additives are not readily available and are therefore imported with high foreign exchange. This has necessitated the need to investigate into other alternative sustainable local materials that can perform similar purpose as the imported ones. This research evaluated the performance of Bamboo Stalk Ash (BSA) as possible additive for oil well cementing as a modifier using a local cement. The BSA was obtained from bamboo harvested in Tarkwa, charred and ash at 600 ℃ in an electric furnace opened to air. The cement slurry experiments were performed in line with API 10B requirement for materials and testing of oil well cement. The Diamond Portland cement was used. The cubes were cured for 8 hours at temperature of 140 oF. The use of the BSA as an additive has positive effect on the local cement slurry properties. All PV values obtained were below the 100 cP, which is desired to keep cement slurry pumpable. The YP values also exceeded 15 lb/100 ft2 indicating prevention of solid settling. The BSA concentrations from 1% to 5% showed enhancement in compressive strength. A concentration of 5% BSA gave the optimal value for achieving the highest compressive strength of 2,205 psi using the local Portland cement. The higher the concentration of the BSA, the higher the slurry density, that is the BHA served as a weighting material. The percentage of free fluid of the slurry decreased as the percentage of BSA was increased, serving as a good free fluid loss agent for well integrity.