Robert Eachus Doan (July 23, 1831 – February 24, 1919) was an American lawyer and politician who served as a U.S. Representative from Ohio for one term from 1891 to 1893.

Born near Wilmington, Ohio, Doan attended common schools there and completed an academic course. He taught for three years in southern Ohio. He graduated from the Cincinnati Law School in 1857 and was admitted to the bar that same year, commencing practice in Wilmington, Ohio.

Doan was editor of the Wilmington Watchman in 1859 and 1860. He served as prosecuting attorney of Clinton County in 1862.

Doan was elected as a Republican to the Fifty-second Congress (March 4, 1891 – March 3, 1893). After his unsuccessful candidacy for renomination in 1892 he resumed the practice of law in Washington, D.C.

Doan died in Wilmington, Ohio on February 24, 1919. His remains are interred at the Sugar Grove Cemetery.

• United States Congress. "Robert E. Doan (id: D000379)". Biographical Directory of the United States Congress.

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