John W. Harreld (January 24, 1872 - December 26, 1950) was a United States Representative and Senator from Oklahoma. Born near Morgantown, Kentucky, he attended the public schools, the normal school at Lebanon, Ohio, and Bryant and Stratton Business College of Louisville, Kentucky, where he taught while studying law. He was admitted to the bar in 1889 and commenced practice in Morgantown. He was prosecuting attorney of Butler County from 1892 to 1896, and moved to Ardmore, Oklahoma in 1906 where he continued the practice of law. He was a referee in bankruptcy from 1908 to 1915, when he resigned to become an executive with an oil corporation. He moved to Oklahoma City in 1917 and engaged in the production of oil and continued the practice of law.
Harreld was elected, on November 8, 1919, as a Republican to the Sixty-sixth Congress to fill the vacancy caused by the death of Joseph B. Thompson and served from November 8, 1919, to March 3, 1921. He was not a candidate for renomination, having become a candidate for the Republican nomination for U.S. Senator; he was elected to the Senate in 1920 and served from March 4, 1921, to March 3, 1927; he was an unsuccessful candidate for reelection in 1926. While in the Senate, he was chairman of the Committee on Indian Affairs (Sixty-eighth and Sixty-ninth Congresses). He was an unsuccessful candidate for election in 1940 to the Seventy-seventh Congress and returned to Oklahoma City, where he continued the practice of law and his interest in the oil business. He died there in 1950, and was interred in Fairlawn Cemetery.