Robert Jacob Lewis (December 30, 1864 – July 24, 1933) was a Republican member of the U.S. House of Representatives from Pennsylvania.

Robert J. Lewis was born in Dover, Pennsylvania on December 30, 1864.

He graduated from the law department of Yale University in 1891 and was admitted to the New Haven, Connecticut, bar in June 1891 and to the bar of York County, Pennsylvania, August 1891.

Lewis was elected school controller of York in 1893 and reelected in 1897 and 1903.

His remains were cremated and the ashes were placed in the Iris Columbarium Mausoleum in St. Louis, Missouri.