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This study investigates the hourly wage gap between 25- and 55-year-old temporary and permanent employees across 30 countries worldwide based on Luxembourg Income Study data from 2000 to 2019 supplemented by other survey data. Two-stage multilevel regressions reveal wage disadvantages for temporary workers, particularly for prime-age workers and those working in medium-/high-level occupations. There is no evidence that a stronger institutional dualization in terms of stronger employment protection for permanent contracts increases the wage gap. Instead partial deregulation matters: In countries where permanent workers are strongly protected, the wage gap is larger if the use of temporary contracts is deregulated. Moreover, results suggest that the larger the size of the temporary employment segment the larger the wage gap. Thus, our findings indicate that stronger institutional and structural labor market dualism amplifies labor market inequality in terms of wage gaps between temporary and permanent workers.