North Atlantic Treaty Organization

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North Atlantic Treaty Organization: members and partners

flag-raising ceremony marking the accession of the Czech Republic, Hungary, and Poland to NATO

Jerzy Buzek, Miloš Zeman, Javier Solana, and Viktor Orbán at a ceremony marking the accession of the Czech Republic, Hungary, and Poland to NATO

Volodymyr Zelensky during the Russian invasion of Ukraine

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NATO summary

North Atlantic Treaty Organization

Q: What is NATO?

The North Atlantic Treaty Organization (NATO) is a military alliance originally established in 1949 to create a counterweight to Soviet armies stationed in central and eastern Europe after World War II. When the Cold War ended, NATO was reconceived as a “cooperative-security” organization.

Q: What does NATO stand for?

NATO is an acronym for North Atlantic Treaty Organization.

Q: How many countries are in NATO?

Currently 32 countries are members of NATO.

Q: Which countries are in NATO?

The 32 current member states of NATO are Albania, Belgium, Bulgaria, Canada, Croatia, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Italy, Latvia, Lithuania, Luxembourg, Montenegro, the Netherlands, North Macedonia, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Turkey, the United Kingdom, and the United States.

Q: What are the newest members of NATO?

Sweden is the newest member of NATO. It joined the alliance as its 32nd member in March 2024. Sweden announced its intention to join NATO in 2022, in response to Russia’s invasion of Ukraine , but its membership bid was held up for two years by objections from Turkey and Hungary. Finland joined NATO in April 2023, also in response to Russia’s invasion of Ukraine.

Also known as: NATO

Written by David G. Haglund

Fact-checked by The Editors of Encyclopaedia Britannica

Last Updated: Jan 21, 2025 • Article History

Quick Facts

Date:: August 24, 1949 - present

Areas Of Involvement:: defense

Related People:: Dwight D. Eisenhower; Harry S. Truman; Konrad Adenauer; Eric K. Shinseki; John Shalikashvili

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What is NATO?

What does NATO stand for?

How many countries are in NATO?

Which countries are in NATO?

What are the newest members of NATO?

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North Atlantic Treaty Organization (NATO), military alliance established in 1949 that sought to create a counterweight to Soviet armies stationed in central and eastern Europe after World War II. Following the end of the Cold War, NATO was reconceived as a “cooperative-security” organization. It has 32 member states. The heart of NATO is expressed in Article 5 of the North Atlantic Treaty (also called the Washington Treaty), which founded the alliance on April 4, 1949. In Article 5, the signatory members agree that NATO invoked Article 5 for the first time in 2001, after the September 11 attacks organized by ...(100 of 2921 words)

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