Lewis Cass Carpenter (February 20, 1836 – March 6, 1908) was a U.S. Representative from South Carolina.
At an early age he began writing for the press, and was connected with some New York papers for several years.
He also was secretary to United States Senator William A. Buckingham, of Connecticut from 1868 to 1873.
Carpenter was elected as a Republican to the Forty-third Congress to fill the vacancy caused by the resignation of Robert B. Elliott and served from November 3, 1874, to March 4, 1875.
Later he was appointed United States post-office inspector in 1881, resigning that post in 1883.