Inheritance study was carried out through combining ability for identification of potential parental cultivars, F1 hybrids,and nature of gene action involved in morphological and yield traits in 8 × 8 diallel crosses of Brassica napus L. Genotypes revealed highly significant differences for all the traits i.e., days to 50% flowering, primary branches perplant, pods per main raceme, pod length and seed yield per plant. Mean squares due to general (GCA), specific (SCA)and reciprocal combining ability (RCA) were highly significant for all the studied traits, which revealed imperative role of dominance, additive, and maternal effects. Comparatively higher values of σ2SCA than σ2GCA and σ2RCA with less than unity ratios of σ2GCA/σ2SCA showed the predominance of non-additive gene action for the inheritance of the studied traits followed by maternal effects. Parental cultivars, Abassin-95 and Punjab Sarsoon were identified as best general combiners and in combination with other genotypes performed better for majority of the traits. The F1 hybrids i.e., Rustam Canola × Faisal Canola, Punjab Sarsoon × Dunkled and Dunkled × Rainbow showed prominent SCA and best mean performance for studied traits. Therefore, the involvement of high and low general combiners performed well in the synthesis of superior F1 populations of rapeseed