Both the EU and the UN maintain lists of terrorist organisations. Member states are obliged to apply financial sanctions (such as asset freezes) on the organisations on these lists.
The EU list can be accessed at the following website:
http://ec.europa.eu/comm/external_relations/cfsp/sanctions/list/consol-list.htm
The New Consolidated List of Individuals and Entities Belonging to or Associated with the Taliban and the Al-Quaida Organisation, as established and maintained by the United Nations 1267 committee, can be accessed at the following website:
http://www.un.org/Docs/sc/committees/1267/1267ListEng.htm