Cowpea (Vigna unguiculata (L.) walp) variety CO7 was exposed to varying doses of gamma rays to study their effect on various characters like plant height, number of leaves per plant, number of branches per plant, days to first flower, number of cluster per plant, number of pods per plant, number of seeds per plant, hundred seed weight and yield per plant. In M1 generation the results revealed that there was more reduction at higher doses compared to lower doses for all the characters. The results were obtained in the present study clearly indicate that different doses of gamma rays can be effectively utilized to create variability for various quantitative traits of the crop.© 2013 Universal Research Publications. All rights reserved