The United States Senate is a legislative chamber in the bicameral legislature of the United States of America, and together with the U.S. House of Representatives makes up the U.S. Congress. First convened in 1789, the composition and powers of the Senate are established in Article One of the U.S. Constitution. Each U.S. state is represented by two senators, regardless of population, who serve staggered six-year terms. The chamber of the United States Senate is located in the north wing of the Capitol, in Washington, D.C., the national capital. The House of Representatives convenes in the south wing of the same building.

The Senate has several exclusive powers not granted to the House, including consenting to treaties as a precondition to their ratification and consenting to or confirming appointments of Cabinet secretaries, federal judges, other federal executive officials, military officers, regulatory officials, ambassadors, and other federal uniformed officers, as well as trial of federal officials impeached by the House. The Senate is widely considered to be both a more deliberative and more prestigious body than the House of Representatives, due to its longer terms, smaller size, and statewide constituencies, which historically led to a more collegial and less partisan atmosphere.