Benjamin Head Warder[a] (November 15, 1824 – January 13, 1894) was an American manufacturer of agricultural machinery, based in Springfield, Ohio, for much of his career.

Senior partner Ross Mitchell retired in 1880, and the firm became Warder, Bushnell & Glessner Company.

[4] It manufactured harvesting machinery – reapers, binders, mowers and hay rakes – under the "Champion" brand name.

[9] After Warder retired from business in 1886, he moved his family to Washington, D.C., and built a house at 1515 K Street NW.

Boston architect Henry Hobson Richardson is credited with the design, but died four months into the project.

As a memorial to his parents, Warder commissioned Shepley, Rutan and Coolidge to design a new public library for Springfield, Ohio.

[12] Warder commissioned a speculative office building, designed by architect Nicholas T. Haller and constructed at 9th & F Street NW, Washington, DC (1892).

[14] His body was returned to the United States, where he was buried in Rock Creek Cemetery in a bronze sarcophagus weighing 3,500 lbs, cast by the Gorham Manufacturing Company of Elmwood, Rhode Island.