The Multifactor Leadership Questionnaire is the most frequently used leadership measure in scholarship and organizational practice. However, so far it has not been validated in the Polish context. Therefore, the present study aimed to validate and shorten the MLQ in the Polish organizational setting. A total sample of 1,065 employees from different organizations took part in two sessions of an online study. Respondents were between 18 and 70 years old with an average job tenure of 17.00 years. In subsample 1, (...) using exploratory factor analysis, a three-factor structure of the MLQ full form was established, comprising transformational-supportive, inspirational goal-oriented, and passive-avoidant leadership. Based on qualitative and quantitative criteria, we constructed an 18-item MLQ short form. Both forms were supported by the confirmatory factor analysis in subsample 2. The MLQ-FF and MLQ-SF factors displayed acceptable to high levels of item-related parameters, as well as scale-related reliability. Both forms indicated high convergent and predictive validity examined by correlations with authentic leadership and employee's work outcomes. Our study provided the full and the short form of the MLQ as reliable and valid instruments, potentially suitable to measure leadership styles in academic research and organizational practice. (shrink)