Stewart McClenaghan (14 July 1866 – 22 March 1944) was a Conservative member of the House of Commons of Canada.
He was born in Oxford Mills, Ontario and became a clothing retailer.
The son of William John McClenaghan and Sarah Boyd, he was educated in Ottawa and went into business there.
After serving his only term, the 15th Canadian Parliament, McClenaghan was defeated in the 1926 election by Edgar-Rodolphe-Eugène Chevrier of the Liberals.
His great-great grandson is actor and model Robbie Amell.