William Thomas Lucas (1875–1973) was a Canadian farmer and a federal politician. He was born in Bailieboro, Ontario, on July 26, 1875, to John William and Margaret (née Fair) Lucas, both of Irish descent. He attended public schooling in the Bailieboro area as well as the Ontario Agricultural College. On 9 January 1903, Lucas married Charlotte "Lottie" Perrin, of Bailieboro. With her he had three children. His religion was listed as Anglican. During his terms in office, he resided at Lougheed, Alberta, where he also farmed. William Thomas Lucas died March 27, 1973, in Peterborough.