A field experiment was persuaded at the Horticulture Farm of Bangladesh Agricultural University, Mymensingh from October 2018 to April 2019 to evaluate the effects of nitrogen and phosphorus on the growth and yield of sweet pepper. The trial consisted of two-factors, Factor A: four doses of nitrogen viz., a) N0 = 0 kg N ha-1, b) N1 = 50 kg N ha-1, c) N2 = 100 kg N ha-1, d) N3 = 150 kg N ha-1 and Factor B: four doses of phosphorus, viz., a) P0 = 0 kg P ha-1, b) P1 = 30 kg P ha-1, c) P2 = 60 kg P ha-1, d) P3 = 90 kg P ha-1. Three replications of the Randomized Block Design (RBD) were used to set up the experiment and seedlings of the sweet pepper variety BARI Misti Morich-1 were employed. The findings exposed that N and P strongly influenced every parameter examined. Different nitrogen and phosphorus doses had a substantial impact on growth and yield of sweet pepper. The best tall plant, count of primary and secondary branches, count of fruits plant-1, individual fruit weight and yield were 45.40 cm, 3.91, 22.76, 11.55, 53.26 g and 25.85 ton ha-1 respectively produced from nitrogen 150 kg ha-1. The highest doses of phosphorus (90 kg ha-1) produced the most satisfactory yield on plant height (44.69 cm), number of primary and secondary branches were 3.72 and 22.71 respectively, fruits plant-1 (11.01), individual fruit weight (49.20 g) and yield (21.81 ton ha-1). The maximum doses of nitrogen and phosphorus (150 kg ha-1 and 90 kg ha-1) respectively showed the best performance on plant height (46.00 cm), leaves plant-1 (125.26), count of primary (4.55) and secondary (23.31) branches, fruit length (6.28 cm), fruit diameter (4.68 cm), fruits plant-1 (12.33), individual fruit weight (54.59 g), yield plant-1 (495.54 g) and yield ( 26.67 ton ha-1) were obtained. According to the findings, addition of nitrogen and phosphorous to the soil influenced the growth and yield of sweet pepper.