欧洲原子能共同体（英语：European Atomic Energy Community），由欧洲联盟成员国组成的国际组织。 在1957年3月25日，《欧洲煤钢联营条约》成员国签订《罗马条约》，决定成立共同市场及原子能共同体。 后来，根据《1965年布鲁塞尔条约》（Merger Treaty）在1967年将《欧洲煤钢联营条约》及欧洲经济共同体的合并到统一架构内。如今，欧洲原子能共同体已经在欧洲联盟架构内。

欧洲原子能共同体成立目的为核子能源联营及分销共同市场，并可出售剩余核子能源至境外国家。

The European Atomic Energy Community (EAEC or Euratom) is an international organisation founded in 1957 with the purpose of creating a specialist market for nuclear power in Europe, developing nuclear energy and distributing it to its member states while selling the surplus to non-member states. It is legally distinct from the European Union (EU), but has the same membership, and is governed by the EU's institutions. Since 2014, Switzerland has also participated in Euratom programmes as an associated state.