The article examines the EU’s policy framework, programs and tools on support to transitional justice, and evaluates their impact and challenges. Transitional justice refers to the various ways of addressing the past human rights violations and serious crimes that occurred in contexts of political transition, such as post-conflict or post-authoritarian situations. The EU has adopted a comprehensive policy framework on support to transitional justice in 2015, which defines its principles, objectives, and modalities of engagement with partner countries and international and regional organisations on transitional justice issues. The EU has also used various instruments and actions to support transitional justice initiatives worldwide, such as providing financial assistance, engaging in political dialogue, offering technical expertise, and advocating for transitional justice norms and standards. The article also illustrates how the EU has supported transitional justice processes in different contexts and regions, such as dealing with the legacy of World War II, the fall of communism in Central and Eastern Europe, the war in the former Yugoslavia, and the Arab Spring. The article concludes by identifying some of the achievements and shortcomings of the EU’s involvement in transitional justice processes, such as contributing to accountability, recognition, trust, reconciliation, and non-recurrence; but also facing inconsistency, selectivity, conditionality, interference, cooptation, politicisation, fragmentation, duplication, etc. The article also suggests some ways to improve the EU’s policy framework, programs and tools on support to transitional justice, such as enhancing consistency, coherence, coordination, complementarity, and adaptability. The article also explores how the EU’s role and approaches in the field of transitional justice can affect its own identity and credibility as a global actor that promotes human rights, democracy, and the rule of law as core values of its external action.