.eu is the country code top-level domain (ccTLD) for the European Union (EU). Launched 7 December 2005, the domain is available for organisations and citizens in EU member states. The TLD is administered by EURid, a consortium consisting of the national ccTLD registry operators of Belgium, Sweden, Italy and the Czech Republic. Trademark owners were able to submit registrations through a sunrise period, in an effort to prevent cybersquatting. Full registration started on 7 April 2006.

The .eu TLD was approved by ICANN on 22 March 2005 and put in the Internet root zone on 2 May 2005. Even though the EU is not a country (it is a sui generis intergovernmental and supranational organisation), there are precedents of issuing top-level domains to other entities—e.g. .nato.

.eu.int was the subdomain most used by the European Commission and the European Parliament, based on the .int generic top-level domain (gTLD) for international bodies, until 9 May 2006. The .eu domain (ccTLD) was launched in December 2005, and because of this most .eu.int domain names changed to .europa.eu on Europe day, 9 May 2006.