The aim of this study was to develop the Diabulimia Knowledge Level Scale. The nurses voluntarily participated in the research (n = 384). The Diabulimia Knowledge Level Scale consists of 19 items and four factors. The four factors that make up the scale according to the results of Exploratory Factor Analysis explain 68.53 % of the total variance. The total Cronbach alpha coefficient of the scale was found to be 0.92. The Diabulimia Knowledge Level Scale is the first scale developed to determine the level of diabulimia knowledge among nurses. The scale is valid and reliable.