The Atlantic Council is an American think tank in the field of international affairs, favoring Atlanticism, founded in 1961. It manages sixteen regional centers and functional programs related to international security and global economic prosperity. It is headquartered in Washington, D.C. It is a member of the Atlantic Treaty Association.

Atlanticism, also known as Transatlanticism, is the ideology which advocates a close alliance between nations in Northern America and in Europe on political, economic, and defense issues. The purpose is to maintain or increase the security and prosperity of the participating countries and protect liberal democracy and the progressive values of an open society that unite them under multiculturalism. The term derives from the North Atlantic Ocean, which is bordered by North America and Europe.