In response to the remaining wage gap, many European countries have implemented non-transferable paternity leave that is exclusive for fathers, as a policy aim to redistribute caregiving responsibilities and possibly reduce gender career interruptions. This thesis therefore investigates the association of non-transferable paternity leave on the gender wage gap across 26 European countries between 2000 and 2022 using aggregated panel data with random effects. To explore whether non-transferable paternity leave might influence the wage gap through a more indirect mechanism, the analysis also examines a set of potential indirect pathways. While these indirect associations are largely statistically insignificant in the fully specified model, a few variables such as male and female tertiary education and male part-time employment show notable patterns. Although these indirect pathways do not appear to have a strong influence on the wage gap, they highlight the complexity of gendered labor dynamics. Rather than offering straightforward answers, these findings suggest that non-transferable paternity leave alone may not be sufficient to shift wage outcomes without broader institutional and cultural changes.