George Roy McWilliam (July 21, 1905 – May 15, 1977) was a Member of Parliament in the Canadian House of Commons for the constituency of Northumberland—Miramichi in New Brunswick from 1949 until 1968.

He was a resident of Newcastle, New Brunswick for most of his life, where he was the publisher and editor of the North Shore Leader, a local weekly newspaper.

McWilliam was a Liberal and served as Parliamentary Secretary to the Postmaster-General from 1963 to 1964 and to the Minister of Public Works from 1964 to 1965.

McWilliam served as MP through the middle of a long period of Liberal ascendancy in the Miramichi Valley.

Added to this were the votes of the French-speaking Acadians of Neguac, Rogersville, Beaverbrook and Baie-Sainte-Anne and surrounding areas.