Thomas Cusack (October 5, 1858 in Kilrush, County Clare, Ireland – November 19, 1926 in Oak Park, Illinois) was a pioneer and entrepreneur in the outdoor advertising industry and a politician, serving as a Democratic U.S. Representative from Illinois' 4th District from 1899 to 1901. Thomas Cusack died on November 19, 1926, at the age of 68. He is buried in Calvary Cemetery in Evanston, Illinois. In the 1970s, Cusack's last surviving daughter donated Marigreen Pines to the Congregation of Holy Cross to serve as their novitiate.