Twenty–three genotypes of Indian mustard [Brassica juncea (L.) Czern. and Coss.] were examined in irrigated conditions. The analysis of variance (ANOVA) was performed on 14 quantitative traits. Genetic variability showed that, the PCV was comparatively higher than GCV for all the characters studied and variation was majorly due to the effect of environment. Days to 50% flowering, number of primary branches per plant, length of main raceme, number of siliquae per plant, number of seeds per siliquae, biological yield per plant, test weight, and harvest index all showed high heritability along with high GA. Number of siliquae per plant showed positive and significant correlation with seed yield per plant. 23 genotypes were grouped into 7 clusters based on D2 values using Tocher’s method. Out of total 7 clusters, cluster I contains 12 genotypes forming the largest cluster followed by cluster IV, cluster II containing 4 and 3 genotypes respectively and the remaining clusters had one genotype in each.