In order to study the response of concentration and composition of essential oil of coriander (Coriandrum sativum) to cattle manure and nitrogen fixing bacteria, an experiment was conducted as factorial experiment in the base of randomized complete blocks design with twelve treatments and three replications at homand research station in Damavand of Iran in 2010. The factors were cattle manure in four levels (5, 10, 15 and 20 ton/ha) and nitrogen fixing bacteria in three levels (inoculation with azotobacter, inoculation with azospirillum and inoculation together). Results showed that the highest essential oil content and linalool and alpha pinene in essential oil were obtained with application of 10 ton/ha cattle manure. The maximum gamma terpinene and the minimum geranyl acetate in essential oil were obtained after applying 15 ton/ha cattle manure. Nitrogen fixing bacteria also showed significant effects on linalool, alpha pinene and geranyl acetate in essential oil (except essential oil content and gamma terpinene in essential oil) as the highest linalool in essential oil in treatment of inoculation with azotobacter, the maximum alpha pinene in essential oil in treatment of inoculation with azospirillum and the maximum geranyl acetate in inoculation together (azotobacter & azospirillum) were obtained.