Several meta-analyses using twelve studies were conducted, combining different forms of the belief in a just world (BJW) and the five-factor model in order to determine possible relationships between personality factors and individual differences regarding justice. As expected, the general (n = 2579) and personal (n = 1346) forms of BJW were negatively associated with neuroticism, and positively associated with extraversion and agreeableness. Summary effect sizes for neuroticism, extraversion, and agreeableness were r = −0.08, r = 0.10, and r = 0.09 concerning the general BJW, and r = −0.25, r = 0.18, and r = 0.10 concerning the personal BJW, respectively. Although no causality could be determined, possible interpretations of the relationships include BJW as a personal resource that increases emotional stability, BJW and extraversion’s reciprocity in the developmental process, and trust as an origin of both agreeableness and just world beliefs. In addition, the associations were significantly stronger when the personal BJW was used, as opposed to the general form, but only regarding neuroticism and extraversion. Attitudes concerning others and their well-being may explain the differential gap of associations when using BJW for the self or for others.