Ben Nighthorse Campbell (born April 13, 1933) is an American politician. He was a U.S. Senator from Colorado from 1993 until 2005 and was for some time the only Native American serving in the U.S. Congress. Campbell was a U.S. Representative from 1987 to 1993, when he was sworn into office as a Senator following his election on November 3, 1992. Campbell also serves as one of the 44 member Council of Chiefs of the Northern Cheyenne Nation.
Originally a member of the Democratic Party, Campbell switched to the Republican Party in 1995. Reelected in 1998, Campbell announced in March 2004 that he would not run for reelection to a third term in November of that year. He expressed interest in running for Governor of Colorado in 2006. However, on January 4, 2006, he announced that he would not enter the race. His Senate seat was won by Democrat Ken Salazar in the November 2004 election.