The field experiment to study the comparative performance of drip irrigated onion under different plant density and fertilizer levels was conducted at Chilli and Vegetable Research Unit, Dr. PDKV, Akola, during rabi season of 2018-19, which comes under Western Vidarbha Region of Maharashtra. The experiment, comprising of 9 treatment combinations replicated three times, laid out in factorial Randomize block design with three plant density 10 x 7.5 cm, 10 x 10 cm, and 10 x 12.5 cm and three fertilizer levels (80%, 100% and 120% recommended dose of NPK). Plant spacing 10 x 12.5 cm was superior over different plant spacing in relation to growth attributes viz., number of leaves per plant, neck thickness, and plant height. However, plant height was maximum under 10 x 7.5 cm plant spacing due to more number of plants accommodated per unit area. 120% recommended dose of fertilizer significantly improved the growth (plant height, number of leaves per plant). Highest gross return ` 2,58,064 was recoreded under application of F3S1 which had also realized in highest B:C ratio followed by F2S1 treatment.