Carl Thomas Curtis (March 15, 1905 - January 24, 2000) was an American politician, most notable as a long-serving congressman and senator from Nebraska. He was a Republican.

Curtis was born on his family's farm in Kearney County, Nebraska. He attended the public schools, and then attended Nebraska Wesleyan University. He studied law on his own and passed the bar exam. He began practicing law in his native county and served as its attorney from 1931 to 1934. He was elected to the United States House of Representatives from a Nebraska district in 1938 on a campaign to oppose the New Deal policies of President Franklin Roosevelt. Curtis served in the House from 1939 until 1954, being reelected every two years.

Curtis ran for the United States Senate from Nebraska from 1954 and won. He was reelected three times and served from 1955 to 1979. He voted for the Civil Rights Act of 1964.

Curtis was loyal to the Republican Party's platform, particularly supporting its anticommunist stances and fiscal conservatism, which included opposition to social programs such as Roosevelt's New Deal and the Great Society programs of Lyndon Johnson. Curtis was a close ally of both Barry Goldwater and Richard Nixon. He served as floor leader during the 1964 nomination of Goldwater at the Republican National Convention. He supported Nixon's handling of the Vietnam War, and remained loyal to him even during the height of the Watergate scandals, during which Nixon was forced to resign as President, a position which few politicians even in the Republican Party took. Curtis served as chairman of the Senate Republican Conference from 1975 to 1979.

Following his retirement from the Senate, Curtis moved to Lincoln, Nebraska where he practiced law and gave occasional interviews to the media. Following his death in Lincoln of natural causes, he was praised on the Senate floor in a speech delivered by Strom Thurmond, a contemporary of Curtis's who was also elected to the Senate in 1954 and held conservative views. Curtis was also a member of Theta Chi Fraternity.