Sewall Spaulding Farwell (April 26, 1834 – September 21, 1909) was a Civil War officer and one-term Republican U.S. Representative from Iowa's 2nd congressional district.

In 1862, after the outbreak of the Civil War, he enlisted in the Union Army as captain of Company H, 31st Iowa Volunteer Infantry Regiment.

In September 1880, Farwell won the Republican nomination on the 124th ballot to succeed Hiram Price as the Iowa 2nd congressional district's representative in the U.S.

He won renomination in 1882, but was defeated in the general election by Democrat Jeremiah Henry Murphy.

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