A field experiment was conducted to evaluate the efficacy of different herbicides for controlling weeds in onion (Allium cepa L.) during Rabi 2019 and 2020. The experiment was laid out in randomized complete block design with seven weed control treatments, viz. pre-emergence application (PE) of oxyfluorfen 199.75 g/ha, post-emergence application (PoE) of quizalofop-ethyl 50 g/ha, quizalofop-ethyl + oxyfluorfen 50 g/ha PoE, quizalofop-ethyl + oxyfluorfen 75 g/ha PoE, quizalofop-ethyl + oxyfluorfen 100 g/ha PoE, hand weeding twice 30 and 60 days after transplanting (DAT) and unweeded control. Quizalofop-ethyl + oxyfluorfen 100 g/ha PoE provided effective weed control with highest bulb yield (31.13 t/ha), highest net returns (Rs. 184.90 ×103/ha) and B: C ratio (2.48). The un-weeded control recorded the lowest net returns (Rs. 80.03 ×103/ha) and benefit: cost ratio (1.63).