This thesis examines how women's participation in peace negotiations impacts the gender inclusivity of Truth and Reconciliation Commissions (TRCs) in Côte d'Ivoire, Liberia, and Colombia. It explores whether higher degrees of women's involvement led to more gender-inclusive TRCs, hypothesising that increased participation results in better integration of gender considerations. Using secondary data and primary interviews from Colombia, the study highlights political pressure as a key causal mechanism. Findings reveal that in Côte d'Ivoire, significant grassroots activism by women without formal negotiation roles led to moderate gender inclusivity in the TRC. In Liberia, limited formal participation in peace negotiations, combined with strong grassroots advocacy and post-conflict decision-making roles for women, resulted in a highly gender-inclusive TRC. In Colombia, women's formal involvement in peace negotiations, alongside continuous advocacy by women’s organisations, led to over 100 gender-specific provisions in the peace agreement, fostering a robust gender-inclusive TRC. These results partially support the hypothesis, showing that higher women's participation generally leads to more gender-inclusive TRCs. The research underscores the importance of institutionalising gender perspectives, leveraging political pressure, and ensuring international support to achieve inclusive and sustainable peace processes. It offers practical insights for enhancing gender inclusivity in transitional justice mechanisms like TRCs.