OAC Prosper is a semi-determinate food-grade soybean (Glycine max (L.) Merr.) cultivar with high yield potential, high seed protein concentration, and resistance to soybean cyst nematode. OAC Prosper is developed and recommended for soybean growing areas in southwestern Ontario with 2950 or greater crop heat units. OAC Prosper has a relative maturity of 1.8.