Elections to the United States Senate will be held on November 7, 2006, with 33 of the 100 seats in the Senate being contested. Since Senators are elected for six-year terms, those elected will serve from January 3, 2007 until January 3, 2013. Those Senators who were elected in 2000 will be seeking re-election (or retiring) in 2006.

For the same date is scheduled the U.S. House election, 2006, as well as many state and local elections.

• U.S. Senate election, 2004