--- - |2 Although past research suggests authoritarianism may be a uniquely right‐wing phenomenon, the present two studies tested the hypothesis that authoritarianism exists in both right‐wing and left‐wing contexts in essentially equal degrees. Across two studies, university (n = 475) and Mechanical Turk (n = 298) participants completed either the RWA (right‐wing authoritarianism) scale or a newly developed (and parallel) LWA (left‐wing authoritarianism) scale. Participants further completed measurements of ideology and three domain‐specific scales: prejudice, dogmatism, and attitude strength. Findings from both studies lend support to an authoritarianism symmetry hypothesis: Significant positive correlations emerged between LWA and measurements of liberalism, prejudice, dogmatism, and attitude strength. These results largely paralleled those correlating RWA with identical conservative‐focused measurements, and an overall effect‐size measurement showed LWA was similarly related to those constructs (compared to RWA) in both Study 1 and Study 2. Taken together, these studies provide evidence that LWA may be a viable construct in ordinary U.S. samples. - Political Psychology, Volume 39, Issue 5, Page 1049-1067, October 2018.