Clement Steele Clarke, known as Clem S. Clarke (October 9, 1897 – March 28, 1967), was an oilman from Shreveport, Louisiana, who was the first member of the Louisiana Republican Party to run for the United States Senate since implementation in 1914 of the Seventeenth Amendment to the United States Constitution. He lost the 1948 race to Democrat Russell B. Long, the older son of Huey Pierce Long, Jr.