The 1903 South Carolina United States Senate election, held January 27, 1903 to select the U.S. senator from the state of South Carolina, was predetermined by the Democratic Party primary election held on August 26, 1902, and September 9. Democrats were so overwhelmingly dominant that their nomination was tantamount to the general election.
The 1902 and 1903 United States Senate elections were elections in which the Democratic Party gained four seats in the United States Senate, but the Republicans kept their strong majority.