1858 United States House of Representatives elections in Ohio

Ohio elected its members October 12, 1858, netting a 3-seat Republican gain.

District	Incumbent	Party	First elected	Result	Candidates
Ohio 1	George H. Pendleton	Democratic	1856	Incumbent re-elected.	Y George H. Pendleton (Democratic) 51.2% Timothy C. Day (Opposition) 48.8%
Ohio 2	William S. Groesbeck	Democratic	1856	Incumbent lost re-election. New member elected. Republican gain.	Y John A. Gurley (Republican) 52.6% William S. Groesbeck (Democratic) 47.4%
Ohio 3	Clement L. Vallandigham	Democratic	1856	Incumbent re-elected.	Y Clement L. Vallandigham (Democratic) 50.5% Lewis D. Campbell (Republican) 49.5%
Ohio 4	Matthias H. Nichols	Republican	1852	Incumbent lost re-election. New member elected. Democratic gain.	Y William Allen (Democratic) 50.2% Matthias H. Nichols (Republican) 49.8%
Ohio 5	Richard Mott	Republican	1854	Incumbent retired. New member elected. Republican hold.	Y James M. Ashley (Republican) 51.3% William Mungen (Democratic) 48.7%
Ohio 6	Joseph R. Cockerill	Democratic	1856	Incumbent retired. New member elected. Democratic hold.	Y William Howard (Democratic) 53.0% Reader W. Clarke (Republican) 47.0%
Ohio 7	Aaron Harlan	Republican	1852	Incumbent lost renomination. New member elected. Republican hold.	Y Thomas Corwin (Republican) 63.8% Charles W. Blair (Democratic) 36.2%
Ohio 8	Benjamin Stanton	Republican	1854	Incumbent re-elected.	Y Benjamin Stanton (Republican) 59.5% William Hubbard (Democratic) 40.5%
Ohio 9	Lawrence W. Hall	Democratic	1856	Incumbent lost re-election. New member elected. Republican gain.	Y John Carey (Republican) 50.3% Lawrence W. Hall (Republican) 49.7%
Ohio 10	Joseph Miller	Democratic	1856	Incumbent lost re-election. New member elected. Republican gain.	Y Carey A. Trimble (Republican) 55.0% Joseph Miller (Democratic) 45.0%
Ohio 11	Albert C. Thompson	Republican	1854	Incumbent retired. New member elected. Democratic gain.	Y Charles D. Martin (Democratic) 50.7% Nelson H. Van Vorhes (Republican) 49.3%
Ohio 12	Samuel S. Cox	Democratic	1856	Incumbent re-elected.	Y Samuel S. Cox (Republican) 51.8% Lucius Case (Democratic) 48.2%
Ohio 13	John Sherman	Republican	1854	Incumbent re-elected.	Y John Sherman (Republican) 57.1% S. J. Patrick (Democratic) 42.9%
Ohio 14	Philemon Bliss	Republican	1854	Incumbent retired. New member elected. Republican hold. Successor died May 31, 1859, leading to a special election.	Y Cyrus Spink (Republican) 56.3% J. P. Jeffries (Democratic) 43.7%
Ohio 15	Joseph Burns	Democratic	1856	Incumbent lost re-election. New member elected. Republican gain.	Y William Helmick (Republican) 50.7% Joseph Burns (Democratic) 49.3%
Ohio 16	Cydnor B. Tompkins	Republican	1856	Incumbent re-elected.	Y Cydnor B. Tompkins (Republican) 52.8% George W. Manypenny (Democratic) 47.2%
Ohio 17	William Lawrence	Democratic	1856	Incumbent retired. New member elected. Republican gain.	Y Thomas C. Theaker (Republican) 50.3% Benjamin T. Sprigg (Democratic) 49.7%
Ohio 18	Benjamin F. Leiter	Republican	1854	Incumbent retired. New member elected. Republican hold.	Y Sidney Edgerton (Republican) 53.3% J. L. Ranney (Democratic) 46.7%
Ohio 19	Edward Wade	Republican	1852	Incumbent re-elected.	Y Edward Wade (Republican) 65.1% J. W. Gray (Democratic) 34.9%
Ohio 20	Joshua Reed Giddings	Republican	1843	Incumbent lost renomination. New member elected. Republican hold.	Y John Hutchins (Republican) 64.7% David Tod (Democratic) 35.3%
Ohio 21	John Bingham	Republican	1854	Incumbent re-elected.	Y John Bingham (Republican) 57.3% Thomas Means (Democratic) 42.7%

See also

• 1859 Ohio's 14th congressional district special election
• 1858 and 1859 United States House of Representatives elections
• List of United States representatives from Ohio