William James Hammell (28 June 1881 – 4 December 1959) was a Canadian politician and farmer who was a Progressive party then Liberal member of the House of Commons of Canada.
He was born in Raymond, Ontario and became a farmer.
In 1922, his party allegiance switched to the Liberals.
After completing his only term in the House of Commons, the 14th Canadian Parliament, Hammell left federal politics and did not seek re-election in the 1925 vote.
William James Hammell died in 1959 and was buried at Ullswater-North Cemetery in Ullswater, Ontario.