Robert N. Stanfield (July 9, 1877 - April 13, 1945) was a United States Senator from Oregon. Born in Umatilla, Oregon, he attended the public schools and the State normal school at Weston. He engaged in the livestock industry and was also interested in banking in Echo and Baker. From 1913 to 1917 he was a member of the Oregon House of Representatives, serving as speaker in 1917.
In 1920, Stanfield was elected as a Republican to the U.S. Senate and served from March 4, 1921, to March 3, 1927; he was an unsuccessful candidate for reelection on the Independent ticket in 1926. While in the Senate he was chairman of the Committee to Examine Branches of the Civil Service (Sixty-eighth Congress) and a member of the Committee on Public Lands and Surveys (Sixty-ninth Congress). He resumed his former business pursuits, and in 1945 died in Weiser, Idaho; interment was in Hillcrest Cemetery.