Although sometimes used interchangeably, the present review highlights the important differences between generalized worldviews suspecting conspiracy at play (conspiracy mentality) and specific beliefs about the existence of a certain conspiracy (conspiracy theory). In contrast to measures of beliefs in specific conspiracy theories, those of conspiracy mentality are more stable, less malleable, less skewed in their distribution and less contaminated by other ideological content. These differences have important implications for empirical research and the theorizing of conspiracy beliefs. Building on an analogy of personality traits, we argue that conspiracy mentality is a relatively stable readiness to interpret world events as being caused by plots hatched in secret, whereas specific conspiracy beliefs are then manifest indicators (partially contaminated by other dispositions).