Charles Grenfill Washburn (January 28, 1857 – May 25, 1928) was a member of the United States House of Representatives from Massachusetts.

Washburn graduated from Worcester Polytechnic Institute in 1875 and from Harvard University in 1880.

He was reelected to the Sixtieth and Sixty-first Congresses and served from December 18, 1906, to March 3, 1911.

After completing his term, he served as director of the Federal Reserve Bank of Boston.

He became president of the Washburn Co. of Worcester, and served in that capacity until his death in Lenox on May 25, 1928.