Onion (Allium cepa) is one of the important commercial vegetable crops grown in India. The present study was conducted on the basis of highest production of onion in Nuh district of Haryana. The block named Tauru was selected for sampling and a total of sixty onion farmers from various villages in this block were selected for this study. The primary data for the agriculture year 2017-18 was collected by survey method using conducting personal interviews of the selected farmers with the help of specially designed schedule. The results revealed that the estimated total cost, gross return, net return, and B:C ratio of onion cultivation were `139968, 188485, 48517 and 1:1.35 per hectare, respectively. There was seasonal variation in price of onion due to its semi-perishable nature and immediate post-harvest sales by the growers. The study revealed that direct marketing of onion was found most profitable in Channel–IV: Producer-consumer among all other marketing channels due to the non-existence of intermediaries between the producer and ultimate consumer.