The 1924 United States Senate election in Iowa took place on November 4, 1924. Incumbent Republican Senator Smith W. Brookhart ran for re-election to a full term in office against Democrat Daniel F. Steck. In the initial vote, Brookhart was certified as the victor over Steck. However, Steck became the first person to successfully challenge a popular election to the Senate in 1926, when the Senate voted to remove Brookhart from office and seat Steck in his place.