This study aimed to investigate the impact of foliar application of sulphur on the yield of Brassica juncea, specifically Rohi Sarsoon cultivar. The study was conducted in Chak No. TDA 117 B Layyah, during the growing season of October 20, 2020, with four treatments designated as T1 (control), T2 (15 kg/ha), T3 (20 kg/ha), and T4 (25 kg/ha) of sulphur. The study used a Randomized Complete Block design with two replications for each treatment. The findings of this study suggest that the application of sulphur had a positive impact on the growth and yield of Brassica juncea. The application of sulphur significantly influenced the plant height, number of pods, and overall yield of Brassica juncea. Treatment T3 showed the maximum plant height, the highest no. of pods, and the highest yield of 1.6 kg/Marla, followed by T2 with a yield of 1.4 kg/Marla, T1 with a yield of 1.1 kg/Marla, and T4 with a yield of 0.9 kg/Marla. The study estimated the yield for each treatment in kg/ha, with T1 yielding 880 kg/ha, T2 yielding 1120 kg/ha, T3 yielding 1320 kg/ha, and T4 yielding 720 kg/ha. The results of this study provide insights into the effects of foliar use of sulphur and its impact on both the yield and quality of Brassica juncea, contributing to a better understanding of the cultivation of this important crop.