<p>The need for justice is universal but its perception may be influenced by psychosocial aspects. To explain the reasons behind the perception of justice Lerner (1980) developed the concept of the belief in a just world (CMJ). This study validates an instrument to measure CMJ in Spain from its Argentinean version (Global Belief in a Just World Scale) by Lipkus (1991). The internal consistency analysis is studied and evidence on convergent validity is provided. The results show coeﬁcientes of ﬁabilidad suitable for use in the general Spanish population. The analysis of scores shows higher levels of CMJ in men. The present work provides an optimal global measure to study CMJ in Spanish-speaking countries.</p>