The studies on ant oxidative effects of bitter leaf and water bitter leaf extracts on edible oils were evaluated during fifteen weeks of storage of refined soybean oil (RSO) and crude groundnut oil (CGO) in a transparent plastic container at room temperature. The bitter leaf and water bitter leaf were obtained, dried, milled, sieved and separately extracted with five different solvents (methanol, water, chloroform, acetone, and ethyl acetate). The water extract of bitter leaf and methanol extract of water bitter leaf were separately added at varying concentrations (200 ppm – 1000 pm) to RSO and CGO stored in transparent plastic containers. Another set of the edible oils which contained no additive (0ppm) and 400 ppm butylatedhydroxytoluene were equally set up for comparison. The refractive index, free fatty acid and acid value of the oil samples were monitored every three weeks using standard methods for a period of fifteen weeks. The solvent extractive value showed that methanol had the highest yield of extract for bitter leaf (8.710%) and water had the highest yield of extract for water bitter leaf (7.315%).The lowest yield of extract was obtained with chloroform for bitter leaf (2.570 %) and water bitter leaf (2.210 %).The result revealed that methanol extracts of water bitter leaf was more effective against hydrolytic rancidity of CGO than RSO while the water extract of bitter leaf was more effective against hydrolytic rancidity of RSO than CGO. The extracts of both plants had little or no effect on the refractive index of the edible oils.