Federally issued documents such as FBI Background checks, documents issued by the IRS, Birth Certificates of US Citizens born abroad and any other document that has been issued by a federal agency must receive an Apostille from the U.S. Department of State.
The U.S. Department of State provides authentication services to U.S. citizens and Greek nationals on documents that will be used in Greece. For the requirements of Apostille by the federal government, click here.
U.S. Department of State
518 23rd Street, NW SA-1
Washington, DC 20520
If you require authentication by the US Federal Government, other than Apostille, click here.