|U.S. Senator from New Mexico|
From: January 3, 2009 – Present
|Successor||Incumbent (no successor)|
|U.S. Representative from New Mexico's 3rd District|
From: January 3, 1999 – January 3, 2009
|Successor||Ben R. Luján|
|Religion||The Church of Jesus Christ of Latter-day Saints|
Thomas Stewart Udall (born May 18, 1948) is the junior United States Senator from New Mexico and a member of the Democratic Party. He has voted with a majority of his Democratic colleagues 94.8% of the time during the current Congress.  Udall serves on the Commerce, Science, and Transportation, Environment and Public Works Committee, the Rules and Administration Committee and the Indian Affairs Committee.
Previously he was a U.S. Representatives from New Mexico's 3rd congressional district, from 1999 through 2009. Tom Udall is the first cousin of Colorado Senator Mark Udall, a Democrat, and the second cousin of former Oregon Senator Gordon Smith, a Republican.