| Roger Rousseau | |
| Term Start: | 1969 |
| Term End: | 1972 |
| Office2: | Ambassador to Cameroon, Chad, Gabon |
| Term Start2: | 1970 |
| Term End2: | 1972 |
| Office3: | Ambassador to Dominican Republic, Venezuela |
| Term Start3: | 1977 |
| Term End3: | 1981 |
| Office4: | High Commissioner to New Zealand, Fiji, Kiribati, Tonga, Tuvalu, Western Samoa |
| Term Start4: | 1981 |
| Term End4: | 1985 |
| Office5: | President and CEO of the Montreal Olympic Organizing Committee |
| Term Start5: | 11 September 1972 |
| Term End5: | 1 August 1976 |
| Predecessor5: | Willi Daume |
| Successor5: | Ignati Novikov (Official Representative) |
| 1Blankname5: | IOC President |
| 1Namedata5: | Lord Killanin |
| Office6: | Chair of the Montreal Olympic Organizing Committee |
| Term Start6: | 20 March 1972 |
| Term End6: | 1978 |
| Predecessor6: | Committee established |
| Successor6: | Position dissolved |
| Birth Name: | Charles Odilon Roger Rousseau |
| Birth Date: | 6 February 1921 |
| Birth Place: | Trois-Pistoles, Quebec |
| Death Place: | Ottawa, Ontario |
| Nationality: | Canadian |
Charles Odilon Roger Rousseau, CC (6 February 1921 – 26 September 1986) was a Canadian ambassador, administrator and soldier. He was head of the Montreal Olympic Organizing Committee (COJO) for the 1976 Summer Olympics in Montreal.
He served in the Royal Canadian Air Force during World War II, but became a prisoner of war in 1942 until the war's end.[1]
He was born in Trois-Pistoles, Quebec and died of cancer in Ottawa, Ontario.[2]