Breeders have centered efforts on productivity and paid little attention to fruit quality, including traits that can increase consumers appeal. Induced mutation is a methods used in creating genetic variations resulting to new varieties with different features. The aim of this study was to qualitatively evaluate the effect of gamma irradiation on fruit colour and shape of three pepper cultivars. Mutation was induced using different doses of gamma irradiation (50, 100, 150 and 200 Gy from 60Co source) in the Gamma Irradiation Facility (GIF), at Nuclear Technology Centre (NTC) of the Sheda Science and Technology Complex, Abuja. The fruit colour at the immature phase exhibited two phenotypic classes of green and dark green. In Tatase 0 Gy and 50 Gy showed 100 % dark green fruits, while 100, 150 and 200 Gy had 100 % green fruits. In Nsukka yellow pepper, there was an increase in the frequency of green colour with 100 Gy, 150 Gy and 200 Gy dosage. At full maturity, the frequency distribution for Tatase showed one phenotypic class of deep red colour while Nsukka yellow pepper showed two phenotypic classes of yellow and orange colour. The results recorded increased frequency of fruits with pointed blossom end in Shombo fruits exposed to the mutagen. The variation obtained in the percentage frequency of the various treatments could then suggest an effect of gamma irradiation on pepper fruit characteristics. Therefore gamma irradiation dosage of 50 Gy – 200 Gy could be exploited in the creation of variability relevant for the diversification of pepper fruit colour and shape.