Present study was conducted to determine the effects of potassium doses applied to mung bean [Vigna radiata (L.) Wilczek] genotypes on seed yield and important yield components. Field trial was carried out in 2020 in the Prof. Dr. Abdülkadir AKÇİN experimental fields belongs to Faculty of Agriculture located in Alaaddin Keykubat Campus. The study consisted of a total of 45 plots with 3 replications by applying 5 potassium doses (0,10,20,30,40 kg/da K2SO4) on 3 mung bean genotypes (Ermenek, Turkmenistan, Aşağıçağlar) and was planned according to the Factorial Trial Design in Random Blocks. According to the results of the analysis of variance, the difference between genotypes was statistically significant in terms of seed yield, while the difference between potassium doses was statistically significant in terms of protein content. According to the results of the research, the highest seed yield was obtained from the Aşağıçağlar genotype with 20.57 g/plant as the average of the potassium doses, and the plots that were applied 20 kg/da of potassium (18.16 g/plant) as the average of the genotypes. Smiliarly, the highest protein content was obtained from the Ermenek genotype (25.18%) and from the plots (25.47%) treated with 10 kg/da potassium. As an average of potassium doses, the Aşağıçağlar genotype came to the forefront in terms of important yield factors such as thousand seed weight (69.13 g), plant height (54.52 cm) and first pod height (26.09 cm).