Benjamin Grubb Humphreys (August 17, 1865 – October 16, 1923) was a U.S. Representative from Mississippi, father of William Y. Humphreys, and son of Benjamin G. Humphreys.
Born in Claiborne County, Mississippi, Humphreys attended the public schools at Lexington, Mississippi, and the University of Mississippi at Oxford. He engaged in mercantile pursuits. He studied law. He was admitted to the bar in 1891 and commenced practice in Greenwood, Mississippi. Superintendent of education for Leflore County 1892-1896. He served as district attorney for the fourth district of Mississippi 1895-1903. Raised a company in April 1898 for service in the Spanish-American War and was its first lieutenant, serving under Maj. Gen. Fitzhugh Lee in Florida during the entire war.
Humphreys was elected as a Democrat to the Fifty-eighth and to the ten succeeding Congresses and served from March 4, 1903, until his death. He served as chairman of the Committee on Territories (Sixty-second Congress), Committee on Flood Control (Sixty-fourth and Sixty-fifth Congresses). He served as delegate to the Democratic National Convention in 1920. He died in Greenville, Mississippi, October 16, 1923. He was interred in Greenville Cemetery.