Bernard Sanders (born September 8, 1941) is an American politician and activist who is the senior United States senator from the state of Vermont. He is the longest-serving independent in U.S. congressional history, but maintains a close relationship with the Democratic Party, having caucused with House and Senate Democrats for most of his congressional career and sought the party's presidential nomination in 2016 and 2020. Sanders has been viewed as the leader of the modern American progressive movement.

Born into a working-class Jewish family and raised in New York, Sanders attended Brooklyn College before graduating from the University of Chicago in 1964. While a student, he was a protest organizer for the Congress of Racial Equality (CORE) and the Student Nonviolent Coordinating Committee (SNCC) during the civil rights movement. After settling in Vermont in 1968, he ran unsuccessful third-party political campaigns in the 1970s. He was elected mayor of Burlington in 1981 as an independent and was reelected three times.

Sanders was elected to the U.S. House of Representatives in 1990, representing Vermont's at-large congressional district. In 1991, he and five other House members co-founded the Congressional Progressive Caucus. Sanders was a U.S. representative for 16 years before being elected to the U.S. Senate in 2006, becoming the first non-Republican elected to Vermont's Class 1 seat since Whig Solomon Foot in 1850. Sanders was reelected in 2012, 2018, and 2024. He chaired the Senate Veterans' Affairs Committee from 2013 to 2015, the Senate Budget Committee from 2021 to 2023, and the Senate Health, Education, Labor and Pensions Committee from 2023 to 2025. He is the senior senator and dean of the Vermont congressional delegation.

Sanders was a candidate for the Democratic presidential nomination in 2016 and 2020, finishing second both times. His 2016 campaign generated significant grassroots enthusiasm and funding from small-dollar donors, helping him win 23 primaries and caucuses. In 2020, his strong showing in early primaries and caucuses made him the front-runner in a large field of Democratic candidates. He became a close ally of Joe Biden after the 2020 primaries. Since Donald Trump's reelection as president in 2024, Sanders has vocally opposed Trump's administration and perceived corruption as what he calls a right-wing oligarchy, rallying an organization tour against Trump and his allies, especially Elon Musk, in an effort to reshape the Democratic Party.

Sanders is credited with influencing a leftward shift in the Democratic Party after his 2016 campaign. An advocate of progressive policies, he opposes neoliberalism and supports workers' self-management. He supports universal and single-payer healthcare, paid parental leave, tuition-free tertiary education, a Green New Deal, and worker control of production through cooperatives, unions, and democratic public enterprises. On foreign policy, he supports reducing military spending, more diplomacy and international cooperation, and greater emphasis on labor rights and environmental concerns in negotiating international trade agreements. Sanders supports workplace democracy and has praised elements of the Nordic model. Some have compared his politics to left-wing populism and President Franklin D. Roosevelt's New Deal.