Willet Casey (February 14, 1762 – April 7, 1848) was a farmer and political figure in Upper Canada.
Casey was a Quaker and was viewed with hostility because he would not join in the combat.
He first settled near Lake Champlain in the belief that it was held by the British.
He was elected to the 5th Parliament of Upper Canada in an 1811 by-election for Lennox & Addington after John Roblin was disqualified because he was a Methodist preacher; Casey was reelected in 1816.
His son Samuel also represented Lennox & Addington in the assembly and his grandson, Willet Casey Dorland, served in the Legislative Assembly of the Province of Canada.