Enlargement of the North Atlantic Treaty Organization (NATO) is the process of including new member states in NATO. NATO is a military alliance of states in Europe and North America whose organization constitutes a system of collective defence. The process of joining the alliance is governed by Article 10 of the North Atlantic Treaty and by subsequent agreements. Countries wishing to join have to meet certain requirements and complete a multi-step process involving political dialogue and military integration. The accession process is overseen by the North Atlantic Council, NATO's governing body.

After its formation in 1949, NATO grew by including Greece and Turkey in 1952 and West Germany in 1955, and then later Spain in 1982. After the Cold War ended, and Germany reunited in 1990, there was a debate in NATO about continued expansion eastward. In 1999, Poland, Hungary, and the Czech Republic were added to the organization, amid much debate within the organization and Russian opposition. Another expansion came with the accession of seven Northern European and Eastern European countries: Estonia, Latvia, Lithuania, Slovenia, Slovakia, Bulgaria, and Romania. These nations were first invited to start talks of membership during the 2002 Prague summit, and joined NATO on 29 March 2004, shortly before the 2004 Istanbul summit. Most recently, Albania and Croatia joined on 1 April 2009, shortly before the 2009 Strasbourg–Kehl summit.

Coordinates: 50°52′34.16″N 4°25′19.24″E / 50.8761556°N 4.4220111°E / 50.8761556; 4.4220111

The North Atlantic Treaty Organization or NATO ( /ˈneɪtoʊ/ NAY-toh; French: Organisation du traité de l'Atlantique Nord (OTAN)), also called the (North) Atlantic Alliance, is an intergovernmental military alliance based on the North Atlantic Treaty which was signed on 4 April 1949. The organization constitutes a system of collective defence whereby its member states agree to mutual defense in response to an attack by any external party. NATO's headquarters are in Brussels, Belgium, one of the 28 member states across North America and Europe, the newest of which, Albania and Croatia, joined in April 2009. An additional 22 countries participate in NATO's Partnership for Peace, with 15 other countries involved in institutionalized dialogue programs. The combined military spending of all NATO members constitutes over 70% of the world's defence spending.

For its first few years, NATO was not much more than a political association. However, the Korean War galvanized the member states, and an integrated military structure was built up under the direction of two U.S. supreme commanders. The course of the Cold War led to a rivalry with nations of the Warsaw Pact, which formed in 1955. The first NATO Secretary General, Lord Ismay, stated in 1949 that the organization's goal was "to keep the Russians out, the Americans in, and the Germans down." Doubts over the strength of the relationship between the European states and the United States ebbed and flowed, along with doubts over the credibility of the NATO defence against a prospective Soviet invasion—doubts that led to the development of the independent French nuclear deterrent and the withdrawal of the French from NATO's military structure in 1966.

Robin Sheppard (sometimes credited as Robin Shepperd) is a British television director who has directed Lucky Jim, Octavia, Cherished, The Bad Mother's Handbook, and episodes of Kingdom, Casualty, Playing the Field and At Home with the Braithwaites. She was jointly nominated for a British Academy Television Award in 1998 for her work on Wing and a Prayer, and Cherished won the Best Drama Documentary Grierson Award in 2005. Shepperd will be directing the 2010 episodic video game, Venus Redemption. Shepperd is currently attached to Apples, a 2012 film adaptation of Richard Milward's 2007 book of the same name.