| Robert Roy Downie | |
| Office1: | Ontario MPP |
| Term Start1: | 1943 |
| Term End1: | 1945 |
| Predecessor1: | Charles Oliver Fairbank |
| Successor1: | Charles Janes |
| Constituency1: | Lambton East |
| Party: | Liberal |
| Birth Date: | 19 March 1896 |
| Birth Place: | Clachan, Oxford Township |
| Occupation: | Farmer |
Robert Roy Downie (March 19, 1896 - 1985) was a farmer and politician in Ontario, Canada. He represented Lambton East in the Legislative Assembly of Ontario from 1943 to 1945 as a Liberal.
The son of John Downie and Mary Anne Wootton, he was born in Clachan, Oxford Township and was educated in Oxford township. In 1920, Downie married Florence Kathleen Trestain. Downie served in the Canadian army during World War I. He was warden for Lambton County in 1936.[1]