A euromyth is what the European Commission calls media stories about its policies which it claims are untrue. Such claims are usually seen as disparaging of the European Commission and its supposed bureaucratic absurdity. The European Commission often claims such stories are invented by the media, while Eurosceptics argue such stories are often true, and that hostile media reaction has caused an unpopular policy to be abandoned. Some Eurosceptics now use the term "Euromyth" to describe inflated claims made about the achievements of the EU.

Sometimes debate as to whether a particular claim is true or not continues long after the original story appeared. On occasions, Euromyths may arise when the actions of a different European organisation, such as the Council of Europe, are erroneously attributed to the EU.

The European Union has introduced a policy of publicly rebutting negative coverage that it regards as unfair or distorted.