Number of member states in NATO 1949-2024

As of 2024, there are 32 member states in NATO following the ascension of Sweden on March 7, 2024. The western military alliance was formed in the aftermath of World War Two, its founding members included Belgium, Canada, Denmark, France, Iceland, Italy, Luxembourg, the Netherlands, Norway, Portugal, the United Kingdom, and the United States. After various stages of enlargement, the alliance has more than doubled in size, with the largest enlargement occurring in 2004 when the alliance welcomed seven new countries.

截至2024年，随着瑞典于2024年3月7日的加入，北大西洋公约组织（NATO）成员国增至32个。该西方军事联盟成立于第二次世界大战之后，其创始成员包括比利时、加拿大、丹麦、法国、冰岛、意大利、卢森堡、荷兰、挪威、葡萄牙、大不列颠及北爱尔兰联合王国以及美国。经过多个阶段的扩张，该联盟规模已超过原有规模的两倍，其中2004年的扩大是最为显著的一次，当时联盟接纳了七个新的国家。