List of Great Britain by-elections (1790–1800) By-elections 17th Parliament (1790–1796)

| Date_ | Constituency | c_u | Former_Incumbent | Winner | Cause_ |
|---|---|---|---|---|---|
| 4 January 1791 | Yarmouth | u* | Thomas Clarke Jervoise | Jervoise Clarke Jervoise | Resignation |
| 4 January 1791 | Yarmouth | u | Edward Rushworth | Sir John Fleming Leicester | Resignation |
| 7 January 1791 | St Germans | u* | Edward James Eliot | William Eliot | Chose to sit for Liskeard |
| 8 January 1791 | Camelford | u | Sir Samuel Hannay | William Smith | Death |
| 21 January 1791 | Appleby | u | Robert Banks Jenkinson | William Grimston | Chose to sit for Rye |
| 12 February 1791 | Cambridge | u* | Francis Dickins | Robert Manners | Chose to sit for Northamptonshire |
| 28 February 1791 | Chichester | c* | Thomas Steele | Thomas Steele | Joint Paymaster of the Forces |
| 1 March 1791 | Dunwich | u | Barne Barne | Miles Barne | Resignation |