Roland Fairbairn McWilliams KC (October 10, 1874 – December 10, 1957) was a Canadian politician and office-holder.
He was also a leading organizer within YMCA, serving as its North American Vice President in 1923 and 1924, and as its Canadian leader from 1922 to 1929.
He does not appear to have sought political office in Manitoba, though his wife, Margaret, was a respected Winnipeg municipal councillor for several years.
A strict temperance follower, McWilliams forbade the serving of alcohol at Government House for the entirely of his time in office.
McWilliams was also a champion rugby union player in his youth, and won the Dominion title with the University of Toronto Juniors in 1893.