Mutational breeding is a cost-effective and time-efficient technique that enhances genetic variability in crops by inducing mutations using physical agents like gamma rays or chemical agents like sodium azide, without involving genetic engineering. The aim of the study was to analyse the effect of gamma radiation and sodium azide (SA) on the growth performance of two soybean varieties (TGX 1987-62F and TGX 1835-10E). Growth parameters included germination percentage, plant height, number of leaves per plant, number of pods per plant, days to 50 % flowering, chlorophyll content, 100-seed weight and total grain yield. The experiment included 20 treatments and was laid out in a randomized complete block design (RCBD). Statistical analysis showed that among the two varieties, the highest rate of germination (60.0 % seedling/plot) was found in TGX 1835 (15Gy) while, 19.67 % seedling/plot was observed at 0.0.2 % SA. Average plant height (64.40 cm) was observed in TGX 1835 irradiated with 10Gy, as compared to the controls (TGX 1987: 55.46 cm and TGX 1835: 60.93 cm). Highest average leaf count in TGX 1987 was 125.67 leaves/plant, irradiated with 10Gy while, 183.33 leaves/plant, treated with 0.02 % SA. The highest total leaf area of 163.19 cm2 was recorded in TGX 1835 in M1 (mutation 1 generation) plants and 163.56 cm2, treated with 0.02 % SA. The gamma ray’s treatment at 10Gy in TGX 1835 affirmed its potential in generating highest yield in M1 plants. Future breeding programs should focus on stabilizing these mutants (M1 and subsequent generations) to develop commercially viable high-yield varieties, for food security.