Matthew McKay (6 October 1858 – 14 February 1937) was a Liberal party member of the House of Commons of Canada.
He was born in West Gwillimbury Township, Ontario and became a dentist, dental surgeon and schoolteacher.
McKay attended high school at Bradford, Whitby Collegiate Institute, Normal School in Toronto and Queen's University in Kingston (Bachelor of Arts) and the Royal College of Dental Surgeons in Toronto.
After serving one term, he was defeated by Ira Delbert Cotnam of the Conservative party in the 1925 election.
McKay died at an Ottawa hospital on 14 February 1937 from influenza and pneumonia before completing his term in the 18th Canadian Parliament.