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A study was conducted for the estimation of heterosis involving 13 parents and their 26 F1s (direct cross) for seed yield, morphological traits and incidence of Alternaria blight resistance in linseed. The analysis of variance (ANOVA) showed highly significant differences among the parents and their F1s for all the characters under study, indicated that sufficient variability was existed in the present set of breeding material and further evaluation would be meaningful. The cross (JAWAHAR 1 x EC 322680) showed positive and significant heterosis over mid parent (64.12**), better parent (28.89**) and standard variety (28.89**) for seed yield and also showed significant heterosis for number of capsules per plant and corolla size whereas one other cross (GS 234 x EC 322680) showed significant heterosis over mid parent (67.92**) and better parent (35.54**) for seed yield. Hence these crosses would be exploited for isolating transgressive segregants for seed yield and its contributing components for genetic improvement of linseed.

Key words: Heterosis, Linseed, Alternaria blight, Seed yield, Morphological traits.