Amy Jean Klobuchar ( KLOH-bə-shar; born May 25, 1960) is an American politician and lawyer serving as the senior United States senator from Minnesota, a seat she has held since 2007. A member of the Minnesota Democratic–Farmer–Labor Party (DFL), Minnesota's affiliate of the Democratic Party, she previously served as the County Attorney of Hennepin County, Minnesota.

Born in Plymouth, Minnesota, Klobuchar graduated from Yale University and the University of Chicago Law School. She was a partner at two Minneapolis law firms before being elected county attorney of Hennepin County in 1998, making her responsible for all criminal prosecution in Minnesota's most populous county. Klobuchar was first elected to the Senate in 2006, succeeding Mark Dayton to become Minnesota's first elected female United States senator. She was reelected by a landslide in 2012, winning almost all of the state's 87 counties. Klobuchar was reelected again in 2018. In 2009 and 2010, she was described as a "rising star" in the Democratic Party.

Klobuchar's political positions align with modern liberalism. She has focused on healthcare reform, consumer protection, agriculture, and climate change. She is known for her folksy, Midwestern demeanor and ability to win in rural Minnesota.

On February 10, 2019, Klobuchar announced her candidacy for the Democratic nomination for president of the United States in the 2020 election; on March 2, 2020, she suspended her campaign and endorsed Joe Biden. In 2021, she became the chair of the Senate Rules Committee.