Roasted flavor is a critical factor in the acceptance of a peanut cultivar. A three-year study was made on the variation in roasted peanut flavor intensity of U.S. peanut cultivars and advanced breeding lines. An initial set of 83 entries was reduced to 71 by removing samples that showed evidence of extraneous environmental conditions, immaturity, and handling or improper sample preparation effects. All entries for the cv. New Mexico Valenicia C, representing the Valencia market type, were lost because of improper roasting or intense fruity flavor. Florigiant, Florunner, and Pronto were used as comparison standards for roasted peanut attribute values in evaluating the Virginia, runner, and Spanish market types, respectively. The positive estimated difference between control and test germplasm sources was largest within the Virginia type, with a least-square mean difference of +1.4 for roasted peanut attribute intensity. Spanish types were next with a positive estimated difference of +1.3, and runner types were lowest with a positive estimated difference of +0.5. Broadsense heritability for the roasted peanut attribute among germplasm sources was determined to be 24%, suggesting a potential for improving the roasted peanut attribute level through proper breeding stratagems.