William Drew Washburn (January 14, 1831 - July 29, 1912) was an American politician. He served in both the United States House of Representatives and the United States Senate as a Republican from Minnesota.
Washburn was born in Livermore, Maine. He moved to Minneapolis, Minnesota around 1857 to practice law. He was elected to the House of Representatives in 1878 and served from March 4, 1879 to March 3, 1885. He was elected to the Senate in 1888 and served from March 4, 1889 to March 3, 1895.
He died in Minneapolis.