Federal may refer to:

• Federal, an adjective describing federalism or a federation
• Federal republic, a federation of states with a republican form of government
• Federal government of the United States, especially as contrasted with State or local government
• Federal district, a subdivision of a federal system of government, generally considered a separate entity under the direct control of the federal government.
• Federal style architecture, a U.S. style of Georgian architecture
• Federal (Amtrak), a passenger train providing overnight Boston–Washington, DC service in 2003 and 2004