| T. B. Sumner | |
| Office: | President pro tempore of the Washington Senate |
| Term Start: | January 12, 1903 |
| Term End: | January 9, 1905 |
| Predecessor: | Joseph George Megler |
| Successor: | George H. Baker |
| Office1: | Member of the Washington State Senate |
| Constituency1: | 38th |
| Term Start1: | January 12, 1903 |
| Term End1: | January 11, 1909 |
| Predecessor1: | Constituency established |
| Successor1: | Jacob Falconer |
| Constituency2: | 31st |
| Term Start2: | January 14, 1901 |
| Term End2: | January 12, 1903 |
| Predecessor2: | John A. Davis |
| Successor2: | A. T. Van de Vanter |
| Birth Date: | 25 March 1857 |
| Birth Place: | Waupun, Wisconsin, U.S. |
| Death Place: | Everett, Washington, U.S. |
| Party: | Republican |
Thomas B. Sumner (March 25, 1857 – April 5, 1934) was an American politician in the state of Washington. He served in the Washington State Senate from 1901 to 1909.[1] From 1903 to 1905, he was President pro tempore of the Senate.[2]