Field experiments were conducted at Tamil Nadu Agricultural University, Coimbatore, India during winter (August - January) seasons of 2002-03 and 2003-04 in cotton to evaluate the effect of intercropping systems and sources of nitrogen involving organic and inorganic sources of nutrients. The experiment was laid out in a split plot design with three replications. Five intercropping systems viz., sole cotton, cotton + onion, cotton + blackgram, cotton + greengram and cotton + lucerne were included in the main plot. The subplot consisted different nitrogen sources involving combinations of inorganic and organic manures namely, 100% recommended inorganic N, 75% inorganic N + 25% N through poultry manure, 75% inorganic N + 25% N through sunnhemp, 75% inorganic N + 25% N through farm wastes and 75% inorganic N + 25% N through weed compost. The results revealed that cotton + blackgram intercropping with 75% inorganic N + 25% N through poultry manure recorded significantly higher yield attributes, yield and BC ratio of cotton in both the years of study.