Connecticut elected its members April 2, 1821.
| District | Incumbent | This race | |||||
|---|---|---|---|---|---|---|---|
| Member | Party | First elected | Results | Candidates | |||
| James Stevens | Democratic-Republican | 1818 | Incumbent retired. New member elected. Democratic-Republican hold. | √ Gideon Tomlinson (Democratic-Republican) 14.3% √ Noyes Barber (Democratic-Republican) 13.8% √ Henry W. Edwards (Democratic-Republican) 13.7% √ John Russ (Democratic-Republican) 13.5% √ Ebenezer Stoddard (Democratic-Republican) 13.4% √ Ansel Sterling (Democratic-Republican) 13.1% √ Daniel Burrows (Democratic-Republican) 9.6% Calvin Willey (Democratic-Republican) 4.1% Timothy Pitkin (Federalist) 1.0% Others 3.5% | |||
| Jonathan O. Moseley | Democratic-Republican | 1804 | Incumbent retired. New member elected. Democratic-Republican hold. | ||||
| Gideon Tomlinson | Democratic-Republican | 1818 | Incumbent re-elected. | ||||
| Elisha Phelps | Democratic-Republican | 1818 | Incumbent lost re-election. New member elected. Democratic-Republican hold. | ||||
| John Russ | Democratic-Republican | 1818 | Incumbent re-elected. | ||||
| Henry W. Edwards | Democratic-Republican | 1818 | Incumbent re-elected. | ||||
| Samuel A. Foot | Democratic-Republican | 1818 | Incumbent lost re-election. New member elected. Democratic-Republican hold. | ||||