Rufus Smith Frost (July 18, 1826 – March 6, 1894) was a U.S. Representative from Massachusetts.

He engaged in mercantile pursuits and participated in local politics, serving as mayor of Chelsea, Massachusetts, in 1867 and 1868, as a member of the Massachusetts State Senate in 1871 and 1872, and of the Governor's council in 1873 and 1874.

Frost presented credentials as a Republican Member-elect to the Forty-fourth Congress and served from March 4, 1875, until July 28, 1876, when he was succeeded by Josiah G. Abbott, who contested his election.

He served as president of the National Association of Woolen Manufacturers from 1877 to 1884, and of the Boston Board of Trade from 1878 to 1880.

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