| Province: | Ontario |
| Fed-Status: | defunct |
| Fed-Created: | 1903 |
| Fed-Abolished: | 1914 |
| Fed-Election-First: | 1904 |
| Fed-Election-Last: | 1911 |
Thunder Bay and Rainy River was a federal electoral district represented in the House of Commons of Canada from 1904 to 1917. It was located in the northwestern part of the province of Ontario. This riding was created in 1903 from parts of Algoma riding.
It consisted of the territorial districts of Thunder Bay and Rainy River.
The electoral district was abolished in 1914 when it was redistributed between Fort William and Rainy River and Port Arthur and Kenora ridings.
This riding has elected the following members of Parliament:
|- |Liberal|James Conmee |align="right"| 2,162 |Conservative|George T. Marks|align="right"|1,734 |Unknown|L. L. Peltier|align="right"|638 |}
|- |Liberal|James Conmee|align="right"|4,562 |Conservative|F. H. Keefer|align="right"| 3,321
|- |Conservative|John James Carrick |align="right"|acclaimed |}