The aim of this study is to develop a valid and reliable instrument to determine the level of school administrators' diversity leadership based on teachers' perceptions. For this purpose, an item pool was created which includes 68 questions based on the literature, and data were obtained from 343 teachers. Exploratory factor analysis (EFA) was applied first, and later confirmatory factor analysis (CFA) was applied for the construct validity. According to EFA results, a scale composed of three sub-dimensions (diversity inclusion and integration, equity, respect for diversity) that explained 67.3% of total variance and 37 items was achieved. Item-total correlations ranged from 0.488 to 0.771, and factor loadings ranged from 0.540 to 0.748. CFA results confirmed a three-factored construct (chi(2)/df=2.36, RMSEA=0.063, SRMR=0.036, NNFI=0.99, CFI=0.99, GFI=0.81). For the reliability analysis Cronbach's alpha and Spearman Brown coefficients were used. Cronbach's alpha internal consistency coefficient was found as 0.98, and Spearman Brown formula split-half reliability coefficient was found as 0.96 for the entire scale. The psychometric properties of the Diversity Leadership Scale (DLS) showed that the scale is a valid and reliable instrument.