John Thomas Simpson (27 October 1870 – 13 December 1965) was a Conservative member of the House of Commons of Canada.
He was born in Waverley, Ontario and became a farmer and a municipal politician.
Simpson attended schools in Simcoe County, including Barrie Collegiate Institute.
In 1919, he was an unsuccessful candidate in the 1919 Ontario election.
After serving one term in the House of Commons, he was defeated by Duncan Fletcher McCuaig of the Liberal party in the 1935 election.