Warren Otis Arnold (June 3, 1839 – April 1, 1910) was a U.S. Representative from Rhode Island.

Born in Coventry, Rhode Island, Arnold attended the common schools.

But, as neither candidate received a majority the general assembly ordered a new election, in which he declined to be a participant.

He continued his former manufacturing pursuits until his death in Westerly, Washington County, Rhode Island on April 1, 1910, aged 70.

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