An experiment was carried out to investigate the "Organic manures effect on the bulb production of onion cultivars under semiarid condition". The experimental design was Randomized Complete Block Design with split plot arrangement with three replications. The experiment was consisted of two factors i.e. the organic manures Farmyard manure (FYM), Poultry manure (PM), Spent mushroom compost (SMC), ½FYM + ½PM, ½FYM + ½SMC, ½PM + ½SMC and 1 /3FYM + 1 /3PM + 1 /3SMC were subjected to main plot at the rate of 10 tons ha-1 and onion cultivars (Parachinar-Local, Swat-1 and Swat-Local) were maintained to the sub plot. The onion yield and bulb production was significantly affected by both of organic manures application and onion cultivars. The application of organic manure (poultry manure) significantly improved the plant height (79.3cm),bulb diameter (10.2cm), average bulb weight (93.4g) and total yield ha-1 (33.9tones), while more number of bulb kg-1 (13.1) was noticed with control treatments. The organic manures alone and organic manures combination showed different variation in yield and bulb production of onion crop. In case of onion cultivars, Parachinar-Local cultivar increased significantly the plant height (69.5cm), bulb diameter (7.7cm), average bulb weight (88.1g) and total yield ha-1 (27.4tones), whereas the Swat-Local cultivar gave more number of bulb kg-1 (11.2). The interaction of organic manure (poultry manure) and onion cultivar (Parachinar-Local) also affected the yield of onion. In case of interaction the organic manure (poultry manure) @ 10 tons ha-1 with onion cultivar (Parachinar-Local) suited for the yield of onion crop. From results it is concluded that the onion cultivar (Parachinar-Local) received organic manure (poultry manure) @ 10 tons ha-1 showed best result in bulb yield at semi-arid condition.