Robert Edward Lee Allen (November 28, 1865 – January 28, 1951) was an American attorney and politician.

From 1917 to 1921 he was deputy collector of internal revenue for the district of West Virginia.

In 1922, Allen was a successful Democratic candidate for the United States House of Representatives.

After leaving Congress, Allen resumed the practice of law in Morgantown, where he worked until retiring in 1927.

In 1929, he moved to Preston County, where he operated a summer resort in Brookside from 1929 to 1939.