Information on the genetic potential of raspberry (Rubus idaeus L.) genotypes for their use in breeding programs is currently limited. We used a diallel mating design to study the breeding values of raspberry primocane fruiting cultivars in terms of their combining ability. The objectives of this study were to identify raspberry genotypes with high general combining ability (GCA) for use in cultivar development, detect the best crosses in terms of their specific combining ability (SCA), and determine the gene action type and heritability of yield and eight of its components. The obtained results showed that the parent cultivar MRSL exhibited the highest GCA effects for the total yield per plant, fruit weight, number of fruit per plant, fruit length, fruit diameter, and number of drupelets per fruit. Genotype C47 had good GCA for the number of canes per plant and plant height and TD-865 had high GCA for high soluble solids content. The narrow-sense heritability estimates were low to moderate (0.00–0.62) for most of the traits, with soluble solids content exhibiting the highest heritability value.