The present investigation was conducted to ascertain the production potentials of different genotypes of onion (Allium cepa L.) were carried out at Zonal Agric. & Horti. Res. Station, Hiriyur, Karnataka during kharif 2010-11. The study comprises 27 genotypes (Bhima super, COL-652, NOL-115, NOL-103, NRCRO-1, NRCRO-2, NRCRO-3, NRCRO-4, NRCWO-1, NRCWO-2, NRCWO-3, NRCWO-4, RO-252, RO-282, HOS-4, VG-18, VG-19, Bhima Kiran, Bhima Red, L-28, PKV white, Pusa white Round, RO-247, RO-316, Sel- 121, Arka kalyan and Satara Garva). These genotypes were supplied under AINRP on onion and garlic and evaluated to identify the high yielding genotypes. The trial was laid out in R.B.D. design with three replications. The results revealed that, the highest and significant total yield (370.50 q/ha) and marketable yield (328.9 q/ha) was noted in the genotype NRCWO-2. The traits polar diameter of bulb (5.40 cm), equitorial diameter of bulb (5.60 cm) and bulb weight (74.20 g) recorded significantly higher in the genotype NRCWO-2. All the genotypes differed significantly for the character studies. Among the different genotypes tested, NRCWO-2 and HOS-4 gave highest total bulb yield and marketable yield and can be taken up for profitable crop of onion during kharif season in Central Dry Zone of Karnataka.