Oscar Sherman Gifford (October 20, 1842 - January 16, 1913) was a Delegate from Dakota Territory to the United States House of Representatives and a member of the House from South Dakota. He was born in Watertown, Jefferson County, New York, and moved with his parents to Wisconsin, settling in Rock County and then in Brown County, Illinois. He served in the Union during the American Civil War.
Following the war Gifford studied law and was was admitted to the bar in 1871, beginning his practice in Canton, Dakota Territory (now South Dakota). He was district attorney for Lincoln County, mayor of Canton, and a member of the State constitutional convention of South Dakota which convened at Sioux Falls on September 7, 1883. He was elected as a Delegate as a Republican, and served from March 4, 1885-March 3, 1889.
Upon the admission of South Dakota as a state he was elected as a Representative, serving from November 2, 1889 to March 3, 1891. He was a candidate for renomination in 1890, and resumed the practice of law in Canton, where he died. He was intered in Forest Hill Cemetery in Canton.
