Fawcett Plumb (December 10, 1834 – June 25, 1919) was an American banker and politician from Ohio. A graduate of Oberlin College, Plumb worked for many years as a secretary to his uncle and father-in-law, Ralph Plumb. Plumb briefly worked as a lawyer, but instead took interest in banking and real estate. He served two terms in the Illinois Senate as an independent.