Shallot (Allium ascalonicum L.) is one of the horticultural commodities with high economic value. Therefore, to increase shallot production, the use of potassium and phosphate fertilizers can be applied. The aim of this research is to determine the growth and yield response of shallot plants to potassium and phosphate fertilizers. This study was conducted from September to November 2023 in the experimental field of the Faculty of Agriculture and Fisheries, Universitas Muhammadiyah Purwokerto. The method used was a Randomized Complete Block Design (RCBD) consisting of two factors: Potassium Nitrate White (KNO3 Putih) - K0 = 0 kg/ha, K1 = 50 kg/ha, K2 = 100 kg/ha, and Mono Potassium Phosphate (MKP) - P0 = 0 kg/ha, P1 = 60 kg/ha, P2 = 120 kg/ha. The presented data were analyzed using ANOVA followed by the DMRT 5% test. The results showed that the application of potassium fertilizer (KNO3 Putih) did not significantly affect all observed variables. Phosphate fertilizer (MKP) application significantly affected the bulb diameter and plant dry weight variables. The interaction between potassium fertilizer (KNO3 Putih) and phosphate fertilizer (MKP) significantly affected the variables of leaf length at 42-56 days after planting, the number of leaves at 35-42 days after planting, bulb diameter, and bulb dry weight.