Thomas Allen "Tom" Coburn (born March 14, 1948) is an American politician and medical doctor. A member of the Republican Party, he was the junior United States Senator from Oklahoma. Coburn was elected to the U.S. House of Representatives in 1994 as part of the Republican Revolution. He upheld his campaign pledge to serve no more than three consecutive terms and did not run for re-election in 2000.

After three years out of politics, Coburn announced his candidacy for the Senate seat being vacated by four-term incumbent Republican Don Nickles. Former Oklahoma City Mayor Kirk Humphreys (the favorite of the state and national Republican establishment) and Corporation Commissioner Bob Anthony joined the field before Coburn. However, Coburn won the primary by an unexpectedly large margin, taking 61% of the vote to Humphreys's 25%. In the general election, he faced Brad Carson, a Democrat who had succeeded him in the 2nd District and was giving up his seat after only two terms.  In the election, Coburn won by a margin of 53% to Carson's 42%. While Carson routed Coburn in the heavily Democratic 2nd District generally, Coburn swamped Carson in the Oklahoma City metropolitan area and the closer-in Tulsa suburbs. Coburn won the state's two largest counties, Tulsa and Oklahoma, by a combined 86,000 votes, more than half of his overall margin of 166,000 votes.  Coburn's Senate voting record is as conservative as his House record.  Coburn was re-elected in 2010. He received 90% of the vote in the Republican primary and 70% in the general election. While he originally planned to not seek a third term due to his self-imposed two term limit, on January 16, 2014 Coburn announced he would resign his office at the end of the year due to his declining health.  On April 29, 2014, Coburn introduced the Insurance Capital Standards Clarification Act of 2014 (S. 2270; 113th Congress) into the Senate and it passed on June 3, 2014.

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