1820 United States House of Representatives elections in Ohio

Ohio elected its members October 10, 1820.

District	Incumbent			This race
District	Member	Party	First elected	Results	Candidates
Ohio 1	Thomas R. Ross	Democratic-Republican	1818	Incumbent re-elected.	√ Thomas R. Ross (Democratic-Republican) 100%
Ohio 2	John W. Campbell	Democratic-Republican	1816	Incumbent re-elected.	√ John W. Campbell (Democratic-Republican)^[a]
Ohio 3	Henry Brush	Democratic-Republican	1818	Incumbent lost re-election. New member elected. Democratic-Republican hold.	√ Levi Barber (Democratic-Republican) 37.8% Henry Brush (Democratic-Republican) 32.9% Thomas Scott 29.3%
Ohio 4	Samuel Herrick	Democratic-Republican	1816	Incumbent retired. New member elected. Democratic-Republican hold. Winner declined to serve, leading to an October 9, 1821 special election.	√ John C. Wright (Democratic-Republican) 50.1% David Chambers (Democratic-Republican) 49.9%
Ohio 5	Philemon Beecher	Federalist	1816	Incumbent lost re-election. New member elected. Democratic-Republican gain.	√ Joseph Vance (Democratic-Republican) 40.9%^[b] Philemon Beecher (Federalist) 44.6% Daniel Smith (Federalist) 7.9% Orris Parrish (Democratic-Republican) 6.3% John Kilbourn 0.3%
Ohio 6	John Sloane	Democratic-Republican	1818	Incumbent re-elected.	√ John Sloane (Democratic-Republican) 91.7% Alred Kelley (Democratic-Republican) 8.2% Others 0.1%

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