Notwithstanding long-simmering controversies around the construct, several studies have gathered consistent evidence of authoritarian attitudes among left-wing voters and activists. Recently, Costello et al. (Clarifying the structure and nature of left-wing authoritarianism. Journal of Personality and Social Psychology, 2021) validated, in the English-speaking context, a three-factor scale to measure left-wing authoritarianism, as well as two shortened versions of the same scale (Costello & Patrick, Development and initial validation of two brief measures of left-wing authoritarianism: A machine learning approach, 2021; composed of 39, 25 and 13 items, respectively). In this article, we used three samples (total N = 2586) to validate the structural and construct validity of a Spanish adaptation of these three versions. The resulting scales exhibited an analogous three-factor structure, adequate internal consistency, and convergent and discriminant validity regarding sex, religion, moral exporting, conspiracy theories, social and economic conservatism, and right-wing authoritarianism.