Eurojust (also written EUROJUST) is an agency of the European Union (EU) dealing with judicial co-operation in criminal matters. Eurojust stimulates and improves the coordination of investigations and prosecutions between the competent authorities in the Member States and improves the cooperation between the competent authorities of the Member States, in particular by facilitating the execution of international mutual legal assistance and the implementation of extradition requests. Eurojust supports in any way possible the competent authorities of the Member States to render their investigations and prosecutions more effective when dealing with cross-border crime.

At the request of a Member State, Eurojust may assist investigations and prosecutions concerning that particular Member State and a non-Member State if a cooperation agreement has been concluded or if an essential interest in providing such assistance is demonstrated.

Eurojust's competence covers the same types of crime and offences for which Europol has competence, such as terrorism, drug trafficking, trafficking in human beings, counterfeiting, money laundering, computer crime, crime against property or public goods including fraud and corruption, criminal offences affecting the European Community's financial interests, environmental crime and participation in a criminal organisation. For other types of offences, Eurojust may assist in investigations and prosecutions at the request of a Member State.