Josiah Bushnell Grinnell (December 22, 1821 – March 31, 1891) was a U.S. Congressman from Iowa's 4th congressional district, an ordained Congregational minister, founder of Grinnell, Iowa and benefactor of Grinnell College. Grinnell married Julia Ann Chapin on February 4, 1852. They had four children: Catharine Hastings Grinnell, George Chapin Grinnell, Mary Chapin Grinnell, and Carrie Holmes Grinnell. Grinnell was also a 'conductor' on the Underground Railroad and was associated with John Brown. He provided shelter to John Brown in 1859 after Brown's anti-slavery raids in Kansas and Missouri.