The Three Percenters is a decentralized, far-right, anti-government movement in the United States. It was formed as a reaction to the election of U.S. president Barack Obama during a time of overall growth in the American militia movement from 2008 to 2009. The name "Three Percenter" derives from an inaccurate claim that only three percent of American colonists fought against the British during the American Revolution.

The Three Percenter movement shares the general ideology of the American militia and patriot movements, including promotion of gun ownership rights and resistance to the U.S. federal government. Many members also belong to other anti-government groups including the Oath Keepers. In more recent years, the movement has broadened to oppose immigrants, Muslims, and left-wing activists such as Antifa.

The group is based in the U.S. and also has a presence in Canada. Many different individuals and groups have identified themselves as "Three Percenters". Despite the lack of formal leadership, Canada has labeled Three Percenters as a terrorist entity. Members of the Three Percenter movement participated in the January 6 United States Capitol attack. In 2021, six men associated with the group were charged with conspiracy in connection to the attack on the Capitol.

The idea for the Three Percenters movement came from gun rights advocate Mike Vanderboegh on a blog called the Sipsey Street Irregulars between 2008 and 2009. Vanderboegh was a member of the Oath Keepers, a group with whom the Three Percenters remain loosely aligned. According to the Anti-Defamation League (ADL), Vanderboegh claimed to be commander of an Alabama militia group, the First Alabama Cavalry Regiment, though he appeared to be its sole member. Vanderboegh claimed to have formerly been a member of Students for a Democratic Society and the Socialist Workers Party who abandoned left-wing politics in 1977 after being introduced to libertarianism.

Vanderboegh said that reading Friedrich Hayek's book The Road to Serfdom pushed him to the right. He became a Second Amendment activist and by the 1990s was involved with the militia movement. After the Oklahoma City bombing in 1995, Vanderboegh became better known for popularizing anti-government conspiracy theories. He self-published a novel titled Absolved online in 2008, calling it "a cautionary tale for the out-of-control gun cops of the ATF". Vanderboegh received national media attention in 2011, when four suspected militia members in Georgia were arrested for a plan for a biological attack supposedly inspired by his novel Absolved. He denied responsibility from the alleged plot. Vanderboegh died on August 10, 2016.

The Three Percenters movement was a reaction to the election of Barack Obama as president of the United States. Members believed that Obama's presidency would lead to increased government interference in the lives of individuals, and particularly stricter gun control laws. The group's Facebook page mostly features posts supporting gun rights.

A popular symbol of the group is the "Nyberg flag", named for its designer Gayle Nyberg. It is a modified Betsy Ross flag with the Roman numeral "III" displayed within the circle of 13 stars. Members will also add "III" to their social media profiles.

Some members belong to law enforcement organizations and the military, as well as anti-government groups such as the Oath Keepers. As of 2019, the national Three Percenters organization employed a hierarchical command structure, including requiring members to take an oath similar to that of the U.S. armed forces. Members also active in the armed forces were asked to swear an additional oath promising to disobey certain official orders, including a refusal to disarm U.S. citizens. Members of the national organization have also been required to vote in elections to oppose laws the group sees as unconstitutional.