Robert Greig Davidson (21 July 1875 – 3 August 1948) was a Liberal party member of the House of Commons of Canada.
He was born in Sherbrooke, Quebec and became a farmer.
Davidson attended high school in Sherbrooke and then St.
Charles Borromeo College in Charlesbourg.
He became a trustee of Stanstead Wesleyan College and director of the Western Townships Agricultural Association.He was first elected to Parliament at the Stanstead riding in the 1935 general election.
He was re-elected for a second term in 1940, but this was declared void in May 1943.
Davidson lost the resulting by-election on 9 August 1943 to Joseph-Armand Choquette.