Forty adult males, half having obeyed and half having defied authoritative commands to give high-voltage shocks to a fellow volunteer in a realistic experimental situation, were administered personality tests and questionnaires several months later. Obedient and defiant Ss showed little differentiation on the MMPI, but differed significantly on the California F Scale (p<.003). Significant attitudinal differences were displayed toward own father, experimenter, experimental confederate, sponsoring university, willingness to shoot at men in wartime, and other concepts, in patterns somewhat similar to “authoritarian personalities.” Experimental validation of personality differences previously reported in association with measures of authoritarianism was thus tentatively demonstrated. Exceptions to authoritarian patterns were noted.