| Lewis Barker | |
| Term Start2: | 1865 |
| Term End2: | 1866 |
| Predecesso23: | James M. Stone |
| Successor2: | Theodore C. Woodman |
| Term Start3: | 1867 |
| Term End3: | 1867 |
| Predecessor3: | James M. Stone |
| Term Start4: | 1870 |
| Term End4: | 1870 |
| Term Start5: | 1867 |
| Term End5: | 1867 |
| Term Start6: | 1864 |
| Term End6: | 1864 |
| Birth Date: | February 18, 1818 |
| Birth Place: | Exeter, Maine |
| Death Date: | October 9, 1890 |
| Spouse: | Elizabeth Hill, m. August 2, 1846 |
| Children: | Evelyn Barker, b. May 11, 1848, d. November 3, 1872.; Lewis Amasa Barker, b. August 12, 1854, d. January 16, 1890. |
| Alma Mater: | Exeter Academy, and Foxcroft Academy |
Lewis Barker (February 18, 1818 – October 9, 1890) was an American lawyer, State Senator, and State Representative from Bangor, Maine who was the Speaker of the Maine House of Representatives.