The 2004 United States Senate election in Ohio took place on November 2, 2004. It was concurrent with elections to the United States House of Representatives and the presidential election. Incumbent Republican U.S. Senator George Voinovich won re-election to a second term with the highest raw vote total in Ohio history. This remains the last Ohio statewide election to date in which a candidate won every county in the state. This was the first election since 1950 that an incumbent Republican Senator from Ohio was re-elected or won re-election for this seat.