Abstract: Dry seeds (10% moisture content) of K851 and Sona of mungbean [Vigna radiata (L.) wilczek] were treated with 10, 20, 30 and 40 kR γ-irradiation to evaluate the extent of macro and micro mutations appearing in the M2 generation and to estimate the potentiality of micro mutations for future use in plant improvement programme. Some important macro mutation like bushy, trailing, multifoliate, cluster pods, synchronous maturity and some sterile mutants were isolated in the M2 generation. Irradiation with gamma ray also provided the scope for selecting the short statured plants as mutants with short height. Significant changes (p>0.05) with wide range of variations had been identified in yield and its contributing characters like number of pods/plant, 100 seed weight and seed yield per plant, cluster of pods/plant, number of leaves/plant, primary and secondary branches/plant, internode length and plant height. Pollen fertility was highest in control than the treatments in both the varieties. Highest seed yield/plant, 100-seed weight, protein content, pod width were noted in 40 kR γ-irradiation. Similarly, highest plant height at 20 kR, internode length at 30 kR and primary branches/plant at 30 kR were observed. The selection of individual plants in the M2 generation can be studied to observe the spectrum of variation for quantitative characters. Observation of mutants like synchronously maturing and multifoliate may be progressed in the M2 generation through directed selection and these stable mutants can be used as donors for restructuring mungbean genotypes.