This study aimed at preparing a Polish self-report version of the Comprehensive Executive Function Inventory (CEFI), verifying its psychometric properties, and shortening it. The sample included 1109 adolescents aged 12 to 19 attending schools located in a city in eastern Poland. Drawing upon the theoretical background of the CEFI and results presented in its manual, we tested three competing factor structures: a unidimensional, nine-factor, and a bifactor structure to verify the inventory’s construct validity. These analyses did not fully confirm any of the hypothesized models. Moreover, the results did not support the analysis of subscale scores. A shortened nine-item version had satisfactory reliability (⍺ = .778; ω = .779), was unidimensional, and scalarly invariant across gender and age.