Onion being important vegetable crop of our country gaining more importance due to its high export potential andinternal consumption. Due to its cross pollinated nature we can observe lot of variation in the genetic component of onioncrop. Analysis of genetic diversity helps to choose the better genotype for specific purpose and we can improve thatcharacter through breeding programme. In this regard an experiment was conducted to study the Genetic diversity of oniongenotypes at the site of All India Co–ordinated Network Research Project on Onion and Garlic (AICRP) the MainAgricultural Research Station UAS, Dharwad. The results revealed that fifty six genotypes were distributed in six clusters,there a moderate to high diversity noticed in these genotypes. The genotypes GKD-3, Bhima Shakti, Bhima Dark Red,GKD-42, Arka Kalyan, Bhima Super, RGP-1, GKD -75 these genotypes present in the cluster II, III, IV, V, and VI and linesL-883, Pune Red, L-863, DOGR-344, L-355, Bhima Kiran, PRO-7, RGP-2, RGP-3, present in the cluster I exhibitedmoderate diversity and having good storage and resistance to disease and pest.