Roland Fairbairn McWilliams KC (October 10, 1874 – December 10, 1957) was a Canadian politician and office-holder. He served as the 13th Lieutenant Governor of Manitoba from 1940 to 1953. McWilliams was born in Peterborough, Ontario. He received a Bachelor of Arts degree from the University of Toronto in 1896, and started his Bachelor of Laws degree at Osgoode Hall the following year. He subsequently worked as a barrister and solicitor. He campaigned for the Ontario Liberal Party in the 1905 provincial election, but was defeated.