Lewis Marshall Long (June 22, 1883 – September 9, 1957) was a U.S. Representative from Illinois.

He graduated from the John Marshall Law School, Chicago, Illinois, in 1929.

He was admitted to the bar in 1930 and commenced practice in Sandwich, Illinois.

He served as chief examiner of the Division of Motor Carriers of the State of Illinois from November 1, 1939, to July 1, 1941, when he resigned to engage in motor carrier practice in addition to law practice.

This article incorporates public domain material from the Biographical Directory of the United States Congress