United States House of Representatives elections, 1866 Ohio Ohio

| District | Incumbent | Party | First_elected | Result_ |
|---|---|---|---|---|
| Ohio 1 | Benjamin Eggleston | Republican | 1864 | Re-elected |
| Ohio 2 | Rutherford B. Hayes | Republican | 1864 | Re-elected |
| Ohio 3 | Robert C. Schenck | Republican | 1862 | Re-elected |
| Ohio 4 | William Lawrence | Republican | 1864 | Re-elected |
| Ohio 5 | Francis C. Le Blond | Democratic | 1862 | Retired Democratic hold |
| Ohio 6 | Reader W. Clarke | Republican | 1864 | Re-elected |
| Ohio 7 | Samuel Shellabarger | Republican | 1864 | Re-elected |
| Ohio 8 | James Randolph Hubbell | Republican | 1864 | Retired Republican hold |
| Ohio 9 | Ralph P. Buckland | Republican | 1864 | Re-elected |
| Ohio 10 | James M. Ashley | Republican | 1862 | Re-elected |
| Ohio 11 | Hezekiah S. Bundy | Republican | 1864 | Retired Republican hold |