TO STUDY GRAIN YIELD AND ITS RELATED TRAITS IN LENTIL, 36 GENOTYPES (OBTAINED FROM A 6 ´ 6 COMPLETE DI_ALLEL CROSSES) WERE PLANTED IN A RANDOMIZED COMPLETE BLOCK DESIGN WITH THREE REPLICATIONS AT RESEARCH FARM, SHAHRE_KORD UNIVERSITY. ANALYSIS OF VARIANCE SHOWED THAT THERE WERE SIGNIFICANT DIFFERENCES AMONG VARIETIES IN ALL OF TRAITS UNDER STUDY. THIS IMPLIES ON GENETIC VARIATION AMONG VARIETIES. RESULTS OF stepwise regression SHOWED THAT NUMBER OF SEEDS PER PLANT, 100 GRAIN WEIGHT AND HARVEST INDEX WERE AT FIRST ENTERED THE MODEL AND ALSO NUMBER OF SEEDS PER PLANT WAS THE MOST AFFECTIVE TRAIT ON GRAIN YIELD PER PLANT. THEREFORE SELECTION COULD BE DONE BASED ON THESE CHARACTERISTICS. CLUSTER ANALYSIS CLASSIFIED ALL GENOTYPES IN 2 SEPARATE GROUPS AND INDICATED THAT CROSSES OFL236´L830, L236´KERMANSHAH, FARS´PRECOZ, FARS´FLIP97, L236´FARS, KERMANSHAH´ FARS, FARS´L830, PRECOZ×FARS, L236´L236, L830´L830, FARS´KERMANSHAH, PRECOZ´L236, FARS´L236 AND FARS´FARS WERE HIGH YIELDING.