Arthur T. H. Williams (1837-1885) was a gentleman farmer, Alberta land speculator, Lieutenant-Colonel of Militia, and Member of the House of Commons during the nineteenth century.

He was the eldest son of John Tucker Williams, was born in Port Hope and was educated at Upper Canada College, Toronto, and at Edinburgh University. He returned to Canada and became a gentleman farmer, taking over Penryn Park after his father's death. He represented East Durham in the Ontario Legislature from 1867 to 1875, and in the House of Commons from 1878 to 1885. By the time of the outbreak of the 1885 Riel Rebellion, Williams had bought eight sections of land in Southern Manitoba from the Canadian Pacific Railway. He joined the military force that was sent by Ontario to put down the uprising, as commander of the 46th (Midland) Battalion of volunteer militia from Port Hope. A few weeks after the battle at Batoche, when returning from a pursuit mission, he became ill and died on the steamer Northcote, near Fort Pitt.