This investigation set out to compare levels of the Dark Triad traits and the Big-Six personality factors in workplace bullies and their victims in 171 people (98 women); social workers, engineers and restaurant employees in Sweden. Two questionnaires, NAQ-R and NAQ-P, were used to determine who feel bullied and who are bullies. The Dark Triad traits were measured using the Short-D3, while the Big-Six were measured by the MiniIPIP6. The relationships of the traits with bullying were analyzed using 2-step hierarchical linear regression. The first step included the Dark Triad––Machiavellianism, subclinical psychopathy, and narcissism. The model explained about half of the variation in bullying. In the next step, the Big-Six factors–honesty-humility, conscientiousness, agreeableness, extraversion, neuroticism, openness–as well as social desirability were entered. This added 9% in explained variance. Machiavellianism and psychopathy were significant positive predictors of bullying in both steps. In step 2, narcissism, neuroticism and honesty-humility were significant positive predictors, while extraversion was a significantly negative predictor. Regression models with the same predictors, but with victimization as the dependent variable, explained only 4% of the variation in step 1, narcissism being the only significant (negative) predictor. In step 2, including the Big-Six factors in the model explained an extra 14%. Significant predictors of victimization were high neuroticism and low extraversion. These were the only traits shared by bullies and bullied. Personality traits may give an indication of who in an organization is most likely to become a target of bullying, as well as who is most likely to bully others.