A study on genetic variability, heritability and genetic advance as percentage of mean was carried out for thirty blackgram genotypes grown in Complete Randomised Block Design (CRBD) with three replications and two rows of each genotype in each replication to determine genetic divergence among the thirty genotypes for eleven agro-morphological traits of blackgram in the rainfed condition of U.T. of J&K during kharif 2021. Understanding genetic diversity among the thirty blackgram genotypes is the backbone of the blackgram improvement breeding programme. Analysis of variance described significant variability among the genotypes for all eleven agro-morphological traits under this study. This indicates a wide range of genetic variability present in the genotypes of the blackgram. The genotypic coefficient of variation (G.C.V.) and phenotypic coefficient of variation (PCV) were high for number of clusters per plant, pod length, number of pods per cluster and number of branches per plant. High heritability along with high genetic advance as percentage of mean (G.A.M.) was observed for the traits viz., plant height, number of clusters per plant, number of branches per plant, seed yield per plant, number of pods per cluster, pod length and number of seeds per pod. Hence, phenotypic selection based on high heritability along with high genetic advance indicating the presence of additive gene action and phenotypic selection for such traits may be helpful in future blackgram improvement programmes.