Abstract: The experiment was conducted to study the effect of plant growth regulators and their time of spray on morphology, yield and yield contributing characters of soybean. Plants of soybean Cv. PB-1 were sprayed three times (T1 = spray at 15 DAS, T2 = spray at 30 DAS and T3 = spray at 45 DAS) with two concentrations (100 and 200 ppm) of gibberellic acid (GA3) and maleic hydrazide (MH). Significant variations exist among the concentrations of growth regulators and with their time of application in respect of morphological, yield and yield contributing characters of soybean. T2 followed by T3 produced the tallest plant with the highest number of branches, leaves, flowers, pods per plant, number of seeds per pod, seed yield per plant, 100-seed weight and seed yield (t ha-1). T1 produced the least of them. GA3 was more effective than MH. GA3 at 100 ppm followed by GA3 at 200 ppm produced the highest number of branches, leaves, flowers, pods per plant, number of seeds per pod, seed yield per plant, 100-seed weight and seed yield (t ha-1) while 200 ppm MH was least effective to produce them. The present study clearly shows that almost all the plants treated with growth regulators performed better than control. However, interaction effect indicated that 100 ppm GA3 treated plants sprayed at 30 DAS (T2C3) showed the best performance.